Österreichische Physikalische Gesellschaft

Österreichische Physikalische Gesellschaft

Österreichische Physikalische Gesellschaft 64. Jahrestagung ECHOPHYSICS – Pöllau 24.–27. September 2014 Mantis Deposition GMBH Mombacher Straße 5...

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Österreichische Physikalische Gesellschaft 64. Jahrestagung

ECHOPHYSICS

– Pöllau

24.–27. September 2014

Mantis Deposition GMBH Mombacher Straße 52 55122 Mainz Deutschland

VAT-Deutschland GmbH Am Hochacker 4 85630 Grasbrunn bei München Deutschland

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Österreichische Physikalische Gesellschaft 64. Jahrestagung – Pöllau 24.–27. September 2014 ECHOPHYSICS

Tagungsprogramm

Impressum Herausgeber

ECHOPHYSICS

Europäisches Zentrum für Physikgeschichte Schloss 1 8225 Pöllau

Druck

Inred GmbH, 8225 Pöllau

Organisation

Peter Maria Schuster

Leitung, Organisation, Programm

Bruno Besser

Tagungsband

Serena Oldeboom

Tagungsbüro

Karl Riedling

EDV

Oliver Schuster

Logistik, Drucksorten, Tagungsband

Andrea Weghofer

Museum

Redaktionsschluss: 9.9.2014

Ehrenschutz Dr. Reinhold Mitterlehner Bundesminister für Wissenschaft, Forschung und Wirtschaft Sekt.-Chef Mag. Elmar Pichlh Verwaltungsbereich Wissenschaft und Forschung

Hermann Schützenhöfer

1. Landeshauptmann-Stellvertreter Steiermark Mag. Christopher Drexler Landesrat Steiermark für Wissenschaft und Forschung

O. Univ.-Prof. Dr. Christa Neuper Rektorin der Universität Graz O. Univ.-Prof. Dipl.-Ing. Dr.techn. Dr.h.c. Harald Kainz

Rektor der Technischen Universität Graz

Danksagungen

Inhaltsverzeichnis Programmübersicht kompakt Energietag 2014 ............................................................................................................. I COND .......................................................................................................................... II FAKT ......................................................................................................................... VII AMP..............................................................................................................................XI Öffentliche Abendvorträge ..................................................................................... XII Plenarsitzung ............................................................................................................. XII LHS ........................................................................................................................... XIV CiP .............................................................................................................................. XV Astro/ExoLife Poster .............................................................................................. XV Pöllauer Tage der Physikgeschichte....................................................................... XV GEP ......................................................................................................................... XVII

Tagungsinformationen Sekretariat, Hörsäle, Postersession ...................................................................... XIX Zahlung ...................................................................................................................... XX Bewirtung, Internetzugang, Übernachtungen .................................................... XXI

Gesamtprogramm detailliert Gesamtprogramm mit Abstracts ............................................................................... 1 Namensindex .............................................................................................................. 70

Anhang Notizen ........................................................................................................................ 74 Karte von Pöllau ......................................................................................................... 80 Plan vom Schloss Pöllau ........................................................................................... 81

Abkürzungen: AMP CiP COND (CM)

FAKT GEP LHS

Atome, Moleküle, Quantenoptik und Plasmen Karriere in der Physik steht für Festkörperphysik (FKP), Oberflächen, Grenzflächen und dünne Schichten (OGD), Physik an Neutronen- und Synchrotronstrahlungsquellen (NESY) Kern- und Teilchenphysik Geschichte der Physik Physik und Schule

Österreichische Physikalische Gesellschaft 64. Jahrestagung 24.–27. September 2014 ECHOPHYSICS – Europäisches Zentrum f. Physikgeschichte Schloss 1, 8225 Pöllau b. Hartberg, Steiermark Programmübersicht Energietag 2014 Mittwoch/Wednesday, 24.09.2014, 10-16:15, Festsaal Schloss Pöllau Zeit time

ID

Vortrag / Presentation Eröffnung der Veranstaltung und Begrüßung der Gäste / Opening of the event and welcoming of participants

10:00 10:05

E T01

Historical aspects of the concept of energy

10:50

E T02

Energie, Wirtschaft und Gesellschaft: eine Zeitreise

Alessandro Pascolini

Werner Watzenig

11:35 11:54 11:55

Kaffeepause / Coffee break E T04

Erdgasversorgung in Österreich Andreas Lederbauer

12:40 13:59

Mittagspause / Lunch break

14:00

E T03

Zur Geschichte der Mobilität – Entwicklung, Barrieren und Chancen

14:45

E T05

Wegkreuzungen mit Information und Kommunikation

15:30

E T06

Geschichte der Kernenergie

Harald Frey

Helmut Malleck

Helmuth Böck

16:15

Ende der Veranstaltung / End of the event

17:00 18:30

Umtrunk und Ausstellungsbesuch ECHOPHYSICS

19:00 20:00

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau Univ.-Prof. Dr. Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald A T01

Die Energiewende Deutschlands – wohin wird sie führen?

I

COND Mittwoch/Wednesday, 24.09.2014, 10-13, 14-18:30, Refektorium COND, Session 1 Chair: Ulrike Diebold

Zeit time

ID

10:00

CM T11

Functional molecules on surfaces: From conducting wires to the role of single atoms

10:30

CM T12

Ordered Indium adatoms on the reduced In2O3(111) surface

Leonhard Grill

Margareta Wagner, Steffen Seiler, Bernd Meyer, Lynn A. Boatner, Michael Schmid and Ulrike Diebold

10:45

CM T13

Growth and characterization of the p-type transparent conducting oxide ZnCo2O4 Bastian Henne, Verena Ney, Fabrice Wilhelm, Katharina Ollefs, Andrei Rogalev and Andreas Ney

11:00

11:15

CM T14

CM T15

The structure of the Fe3O4(001) surface Roland Bliem, Eamon McDermott, Pascal Ferstl, Oscar Gamba, M. Alexander Schneider, Michael Schmid, Peter Blaha, Ulrike Diebold, Lutz Hammer and Gareth Parkinson

Adsorption of formic acid and Methanol on the Magnetite (001) surface Oscar Gamba, Roland Bliem, Heshmat Noei, Andreas Stierle, Michael Schmid, Ulrike Diebold and Gareth Parkinson

11:30 11:59

Kaffeepause / Coffee break

Zeit time

ID

12:00

CM T21

COND, Session 2 Chair: Adolf Winkler Enhancing the reactivity of a Perovskite surface: Deposition of Sr-adatoms and NiO-clusters onto SrTiO3(110)-(4×1) surface Stefan Gerhold, Zhiming Wang, Michele Riva, Xianfeng Hao, Cesare Franchini, Karina Schulte, Michael Schmid and Ulrike Diebold

12:15

CM T22

Development and character of gap states on alkali doping of Sexiphenyl films Eva M. Reinisch, Thomas Ules, Peter Puschnig, Stephen Berkebile, Markus Ostler, Thomas Seyller, Michael Ramsey and Georg Koller

12:30

CM T23

Alkali metal doped para-sexiphenyl monolayers and thin films on Al(110): an angle resolved UV photoemission study Hannes Offenbacher, Georg Koller, Thomas Ules, Eva Reinisch, Peter Puschnig and Michael Ramsey

12:45

CM T24

Organic thin film transistors under ultra-high vacuum conditions: Deposition and device temperature dependent in-situ electrical and surface analytical characterization Roman Lassnig, Michael Hollerer, Bernd Striedinger, Alexander Fian, Barbara Stadlober and Adolf Winkler

13:00 13:59

Mittagspause / Lunch break

II

COND, Session 3 Chair: Peter Hadley

Zeit time

ID

14:00

CM T31

Lattice simulation of Dirac fermions without fermion doubling: application to spintronics

14:30

CM T32

Modeling of Ohmic contacts of nano-devices within the Lindblad equation

14:45

CM T33

First-principles investigation of crystalline topological insulators Pb1 xSnx(Se,Te)

Rene Hammer

Walter Poetz

Kerstin Hummer, Marta Galicka, Ryszard Buczko and Georg Kresse

15:00

CM T34

Formation of mono- and bi-metallic nanowires in vortices in superfluid He nanodroplets Philipp Thaler, Alexander Volk, Florian Lackner, Johannes Steurer, Daniel Knez, Werner Grogger, Ferdinand Hofer and Wolfgang E. Ernst

15:15

CM T35

HR-STEM investigations of metallic nanoparticles grown with superfluid He-droplets Daniel Knez, Philipp Thaler, Alexander Volk, Werner Grogger, Wolfgang E. Ernst and Ferdinand Hofer

15:30 15:45

CM T36

Investigations of defects in semiconductors

CM T37

Investigation of performance limiting point defects at semiconductor-oxide interfaces using electrically detected magnetic resonance

Martin Faccinelli, Stefan Kirnstoetter and Peter Hadley

Gernot Gruber, Markus Koch and Peter Hadley

16:00 16:29

Kaffeepause / Coffee break COND, Session 4 Chair: Oskar Paris

Zeit time

ID

16:30

CM T41

High Precision Experiments with Cold and Ultra-Cold Neutrons

17:00

CM T42

Methodische Entwicklungen in der Neutronenultrakleinwinkelstreuung

Hartmut Abele

Erwin Jericha, Wilfried Mach, Tobias Rechberger, Alexander Zdarzil and Gerald Badurek

17:15

CM T43

Detailed shape retrieval of colloidal inorganic nanocrystals from SAXS-data

17:30

CM T44

Metastable crystal phase in the shell of PbS/CdS core/shell nanocrystals

Max Burian, Gerhard Fritz-Popovski, Oskar Paris and Rainer T. Lechner

Rainer T. Lechner, Gerhard Fritz-Popovski, Maksym Yarema, Wolfgang Heiss and Oskar Paris

17:45

CM T45

In-situ SAXS/WAXS as a novel method to study ion transport phenomena in confined geometry Christian Prehal, Daniel Weingarth, Emilie Perre, Rainer T. Lechner, Heinz Amenitsch, Oskar Paris and Volker Presser

18:00

CM

Raman investigation of Tannin based rigid foams

III

18:15

T46

Andreas Reyer, Gianluca Tondi, Alexander Petutschnigg, Martin Demker and Maurizio Musso

CM T47

Inelastic HAS intensities on Sb(111): Indication of a lowlying acoustic plasmon mode Patrick Kraus, Florian Apolloner, Christian Gösweiner, Giorgio Benedek and Wolfgang E. Ernst

Ende der Veranstaltung / End of session

18:30

COND Donnerstag/Thursday, 24.09.2014, 15-16:45, Festsaal Sparkasse COND, Session 5 Chair: Walter Poetz

Zeit time

ID

15:00

CM T51

15:15

CM T52

Alexander Schmon, Kirmanj Aziz and Gernot Pottlacher

15:30

CM T53

In-situ electrodeposition of Co in a SQUID magnetometer to study the absolute magnetic moment of ultrathin Co layers

15:45

CM T55

Plasmon dispersion and lifetime in the two-dimensional electron liquid

Hidden Scale Invariance in Metallic Elements Felix Hummel, Georg Kresse, Jeppe Dyre and Ulf Pedersen

Density determination of liquid metals

Stefan Toplovec, Heinz Krenn (2) and Roland Würschum

Jürgen Thomas Drachta, Dominik Kreil, Raphael Hobbiger and Helga M. Böhm

16:00

CM T56

Correlated photons from microcavity polaritons

CM T57

Chromium on superfluid Helium nanodroplets: Theoretical investigation of the ground state and selected excited states

Patrick Mai, Mathias Sassermann, Zoltán Vörös, Gregor Weihs and Wolfgang Langbein

16:15

Martin Ratschek, Johann V. Pototschnig, Andreas W. Hauser and Wolfgang E. Ernst

16:30

CM T58

Novel exact closed-form solutions for the resonant frequencies and mode-shapes of Euler-Bernoulli beams with constant thickness and polynomial width Roman Beigelbeck, Michael Schneider, Michael Stifter, Thomas VoglhuberBrunnmaier, Bernhard Jakoby, Ulrich Schmid and Franz Keplinger

16:45

Ende der Veranstaltung / End of session

IV

COND Donnerstag/Thursday, 24.09.2014, 15-16:45, Festsaal Rathaus COND, Session 6 Chair: Rainer Lechner

Zeit time

ID

15:00

CM T61

A simple model to study the influence of topology and distribution of reversible sacrificial bonds on the mechanical behavior of polymers

15:15

CM T62

A tubular resonator operated in wall-thickness-mode for simultaneous longitudinal viscosity and speed of sound sensing of liquids

S. Soran Nabavi and Markus A. Hartmann

Thomas Voglhuber-Brunnmaier, Roman Beigelbeck, Hannes Antlinger, Stefan Clara, Samir Cerimovic, Bernhard Jakoby and Franz Keplinger

15:30

CM T63

Analysis of the propagation of electromagnetic waves in inhomogeneous solids for applications in mining Ronald Meisels, Michael Toifl, Philipp Hartlieb, Friedemar Kuchar and Thomas Antretter

15:45

CM T64

Characterisation of microfiltration membranes by wetting investigations in the ESEM

16:00

CM T65

Experimental and computational aspects of analytical electron tomography and its application to nanomaterials

Manfred Nachtnebel and Peter Pölt

Angelina Orthacker, Georg Haberfehlner, Johannes Tändl, Cecilia Poletti and Gerald Kothleitner

16:15

CM T66

16:30

CM T68

Analysis of amorphous-nanocrystalline silicon thin films by time-of-flight elastic recoil detection analysis and highresolution electron microscopy Krunoslav Juraić, Davor Gracin, Zdravko Siketić and Miran Čeh

16:45

Initial film growth studies of indigo on SiO2 Boris Scherwitzl, Adolf Winkler and Roland Resel

Ende der Veranstaltung / End of session

COND Poster Donnerstag/Thursday, 24.09.2014, 18-19:30, Schloss Pöllau ID

COND, Poster Chair: NN

CM P01

Tuning mesoporous silica films properties by Deep X-ray Lithography for fluidics applications

CM P02

Measurement of selective adsorption resonance lifetimes from drift spectra of ⁴He-Sb(111)

Benedetta Marmiroli, Barbara Sartori and Heinz Amenitsch

Florian Apolloner, Patrick Kraus, Christian Gösweiner, Michael Mayrhofer-Reinhartshuber, Salvador Miret-Artés and Wolfgang E. Ernst

V

CM P03

Effect of humidity and salts on the mesostructure of silica nanoparticles synthesized in the gas phase

CM P04

Sorption-induced deformation of hierarchical silica-based monoliths

CM P05

Characterization of Li charging state of Li₁₋ₓCoO₂ battery cathodes by means of SQUID magnetometry

Barbara Sartori, Benedetta Marmiroli, Fernando Cacho-Nerin and Heinz Amenitsch

Roland Johann Morak, Christian Balzer, Maxim Erko, Christos Triantafillidis, Nicola Hüsing, Gudrun Reichenauer and Oskar Paris

Gregor Klinser, Stefan Topolovec, Heinz Krenn, Harald Kren, Stefan Koller and Roland Würschum

CM P06

Transport simulations of Dirac Fermions on surfaces of topological insulators Walter Poetz and Magdalena Schreilechner

CM P07

Inelastic close coupling calculations reproducing temperature dependency of helium atom scattering experiments on pnictogen surfaces Christian Gösweiner, Patrick Kraus, Florian Apolloner, Salvador Miret-Artès and Wolfgang E. Ernst

CM P08

Development of a molecular beam for surface reactivity studies Daniel Halwidl, Jiri Pavelec, Jan Hulva, Florian Brunbauer, Michael Schmid, Gareth Parkinson and Ulrike Diebold

CM P09

Contact charging of mineral particles studied by Kelvin Probe Force Microscopy

CM P10

Setup of the machine for reactivity studies Jiri Pavelec, Daniel Halwidl, Jan Hulva, Michael Schmid, Gareth Parkinson and Ulrike Diebold

CM P11

AFM morphology investigation of pentacene films in electrodedielectric transition area

Stefan Klima, Monika Mirkowska and Christian Teichert

Michael Hollerer, Roman Lassnig, Adolf Winkler, Bernd Striedinger, Alexander Fian and Barbara Stadlober

CM P12

AFM studies of adsorbed xylan on amorphous cellulose films using functionalized tips Caterina Czibula, Christian Ganser, Albrecht Miletzky, Stefan Spirk, Robert Schennach and Christian Teichert

CM P13 CM P14

Switching single molecules on a metal surface Simon Jaekel, Knud Seufert, Christophe Nacci and Leonhard Grill

MEMS-Magnetfeld Detektion Michael Stifter, Harald Steiner, Wilfried Hortschitz, Thilo Sauterand Franz Keplinger

VI

FAKT Mittwoch/Wednesday, 24.09.2014, 10-13, 14-18:30, Festsaal RAIKA FAKT, Fundamental interactions Chair: Eberhard Widmann

Zeit time

ID

10:00

FAKT T11

Latest results of the CRESST-II experiment

10:15

FAKT T12

Search for the violation of the Pauli Exclusion Principle with electrons

Achim Gütlein and Holger Kluck

Andreas Pichler, Hexi Shi and Johann Marton

10:30

FAKT T13

Measuring the ground state hyperfinestructure of antihydrogen Clemens Sauerzopf, Martin Diermaier, Bernadette Kolbinger, Sebastian Lehner, Chloé Malbrunot, Oswald Massiczek, Martin Simon, Eberhard Widmann and Johann Zmeskal

10:45

FAKT T14

Hyperfine spectroscopy setup for antihydrogen and first results with a hydrogen beam Martin Diermaier, Peter Caradonna, Christoph Klaushofer, Chloe Malbrunot, Oswald Massiczek, Clemens Sauerzopf, Martin Simon, Michael Wolf, Johann Zmeskal and Eberhard Widmann

11:00

FAKT T15

11:15 11:44

Precision measurements of neutron beta decay Gertrud Konrad

Kaffeepause / Coffee break

Zeit time

ID

11:45

FAKT T21

FAKT, Fundamental interactions Chair: Christoph Schwanda qBOUNCE: Frequency's view on Newton's Law Gunther Cronenberg, Hanno Filter, Peter Geltenbort, Tobias Jenke, Martin Thalhammer and Hartmut Abele

Oscillations in the exponential power-law in electron capture decays of hydrogen-like ions

12:00

FAKT T22

Zeit time

ID

12:15

FAKT T23

Daniel Grumiller, Maria Irakleidou, Iva Lovrekovic and Robert McNees

FAKT T24

Canonical charges and asymptotic symmetries in four dimensional conformal gravity holography

Christoph Klaushofer and Paul Bühler

12:30

FAKT, Theory: Gravity Chair: NN Conformal gravity holography in four dimensions

Daniel Grumiller, Maria Irakleidou, Iva Lovrekovic, Robert McNees and Florian Preis

12:45 13:00 13:59

FAKT T25

Higher-Spin Gravity in 2+1 Dimensions Max Riegler

Mittagspause/Lunch break

VII

Zeit time

ID

14:00

FAKT T31

Zeit time

ID

14:15

FAKT T32

FAKT, Theory: Gravity Chair: NN Numerical relativity in asymptotic anti-de Sitter spacetimes Christian Ecker

FAKT, Theory: QCD Chair: NN Holographic Glueball Decay Frederic Brünner, Denis Parganlija and Anton Rebhan

FAKT T33

Effective mass signatures in multiphoton pair production

14:45

FAKT T34

Heavy quarkonia in a sophisticated Bethe-Salpeter-equation meson model

15:00

FAKT T35

A new strategy for hadron phenomenology with the DS-BS-equation approach

15:15

FAKT T36

14:30

Christian Kohlfürst, Holger Gies and Reinhard Alkofer

Thomas Hilger

Andreas Krassnigg

Non-perturbative propagators and running coupling in the conformal window of QCD Reinhard Alkofer, Christian S. Fischer and Markus Hopfer

15:30 15:59

Kaffeepause / Coffee break FAKT, Collider physics Chair: Dietmar Kuhn

Zeit time

ID

16:00

FAKT T41

ATLAS Inner Tracking detectors: Run 1 performance and developments for Run 2

16:15

FAKT T42

Measurement of the decay B->D l nu in fully reconstructed events and determination of the CKM matrix element Vcb at Belle

16:30

FAKT T43

Measurement of the decay B0s -> J/psi phi(1020)

16:45

FAKT T44

Measurement of the decay B0s -> Ds- pi+ at the Belle experiment

Zeit time

ID

17:00

FAKT T45

17:15

FAKT T46

Wolfgang Lukas

Robin Glattauer

Lukas Lechner, Felicitas Andrea Thorne and Christoph Schwanda

David Bricher, Felicitas Andrea Thorne and Christoph Schwanda

FAKT, Collider detectors Chair: NN Time resolution studies for the PANDA time-of-flight detector using SiPM Lukas Gruber, Stefan Enrico Brunner, Johann Marton, Herbert Orth and Ken Suzuki

The Data Acquisition and Preprocessing System of the Belle II Silicon Vertex Detector Richard Thalmeier, Thomas Bergauer, Florian Buchsteiner, Friedl Markus, Christian Irmler, Katsuro Nakamura, Siegfried Schmid, Helmut Steininger and Hao Yin

17:30

FAKT

FAKT Versammlung

VIII

18:30 Ende der Veranstaltung / End of session

18:30

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau 19:00 20:00

A T01

Univ.-Prof. Dr. Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald Die Energiewende Deutschlands – wohin wird sie führen?

FAKT Poster

Donnerstag / Thursday, 25.09.2014, 18-19:30, Schloss Pöllau

FAKT, Poster Chair: NN

ID FAKT P01

Simulations for the measurement of the groundstate hyperfinestructure of antihydogen

FAKT P02

A detector for in-beam measurements of the groundstate hyperfinestructure of antihydrogen

Clemens Sauerzopf

Clemens Sauerzopf

FAKT P03

Non-Standard Model physics in neutron beta decay

FAKT P04

Left-right symmetry in neutron beta decay Michael Klopf, Gertrud Konrad, Wilfried Mach, Heiko Saul, Xiangzun Wang and Hartmut Abele

FAKT P05

Florian Pipper, Johann Zmeskal, Johann Marton, Andreas Pichler and Dominik Steinschaden

FAKT P06

Determination of the Pion Sigma scattering lengths from the charmed Lambda to Sigma pi pi decay using Belle data

Daniel Moser, Gertrud Konrad and Hartmut Abele

Investigation on Possibilities for Prompt Gamma Imaging

Manfred Berger, Ken Suzuki, Christoph Schwanda, Thorne Felicitas and Robin Glattauer

FAKT Freitag/Friday, 26.09.2014, 9-12:15, Festsaal Raika Zeit time

ID

09:00

FAKT T51

FAKT, Detectors and methods Chair: NN Design and setup of a high resolution X-ray detector system for the kaonic deuterium experiment at J-PARC Carolina Berucci, Michael Cargnelli, Johann Marton, Eberhard Widmann and Johann Zmeskal

IX

09:15

FAKT T52

Extending Bayesian evaluation methods to differential angle cross sections and spectra

09:30

FAKT T53

Magnetische Wanderwellenresonatoren für polarisierte Neutronenstrahlen

Georg Schnabel and Helmut Leeb

Erwin Jericha, Stefan Baumgartner, Bernhard Berger, Peter Geltenbort, Christoph Gösselsberger, Masahiro Hino, Sebastian Nowak, Tatsuro Oda, Robert Raab and Gerald Badurek

09:45

10:00

FAKT T54

Laser photodetachment in a gas-filled RF-quadrupole for AMS

FAKT T55

Status of MedAustron – the Austrian ion therapy and research center

Johanna Pitters, Oliver Forstner, Johannes Lachner, Johannes Lahner, Martin Martschini, Alfred Priller, Peter Steier and Robin Golser

Alexander Wastl, Adriano Garonna, Claus Schmitzer, Alexander Koschik, Matthias Kronberger, Liviu Penescu, Christoph Kurfuerst and Tobias Kulenkampff

10:15 10:44

Kaffeepause / Coffee break FAKT, Particle theory & QCD Chair: Reinhard Alkofer

Zeit time

ID

10:45

FAKT T61

Systematic studies of texture zeros in the lepton mass matrices

11:00

FAKT T62

The Role of the Quark-Gluon Vertex Function in the QCD Phase Transition

11:15

FAKT T63

Gluonic three-point correlations in pure Landau gauge QCD

Patrick Ludl and Walter Grimus

Markus Hopfer, Andreas Windisch and Reinhard Alkofer

Adrian Lorenz Blum, Reinhard Alkofer, Gernot Eichmann, Markus Q. Huber, Mario Mitter, Lorenz von Smekal, Milan Vujinovic and Richard Williams

11:30

FAKT T64

Four-fermion condensation in strongly interacting dense matter

11:45

FAKT T65

Measurement of quarkonium production cross sections at CMS

Andreas Windisch, Kai Schwenzer and Mark Alford

Johannes Brandstetter, Ilse Krätschmer and Valentin Knünz

12:00 12:15

FAKT T66

Alpha-nucleus optical potentials for nuclear astrophysics Thomas Srdinko, Georg Schnabel, Doreen Melari Warjri and Helmut Leeb

Ende der Veranstaltung / End of session

X

AMP Mittwoch/Wednesday, 24.09.2014, 14:30-16.30, Festsaal Sparkasse Zeit time

ID

14:30

AMP T01

14:45

AMP T02

15:00

AMP T03

AMP Chair: Markus Kitzler High harmonics from a radio-frequency pre-excited medium Enikoe Seres, Jozsef Seres, Georg Winkler and Thorsten Schumm

Attosecond dynamics of parametric amplification at 11 nm Jozsef Seres, Enikoe Seres, Björn Landgraf, Boris Ecker, Bastian Aurand, Andreas Hoffmann, Georg Winkler, Shinichi Namba, Thomas Kühel and Christian Spielmann

Extreme ultraviolet light source based on intracavity high harmonic generation in a mode locked Ti:sapphire oscillator with 9.4 MHz repetition rate Enikoe Seres, Jozsef Seres and Christian Spielmann

15:15

AMP T04

15:30

AMP T05

Zeit time

ID

15:45

AMP T06

Comparison of multi-photon and EUV single-photon probing using a novel time-resolved EUV spectrometer Markus Koch, Jakob Grilj, Emily Sistrunk, Thomas J. A. Wolf and Markus Gühr

Systematic investigation of the absorption spectrum of La atoms using laser excitation and optogalvanic detection Tobias Binder and Laurentius Windholz

16:00

16:15

AMP Chair: Markus Koch Attosecond spatial control of electron emission dynamics Li Zhang, Xinhua Xie, Stefan Roither, Daniil Kartashov, Yueming Zhou, Yanlan Wang, Chuanliang Wang, Markus Schöffler, Paul Corkum, Andrius Baltuska, Peixiang Lu, Igor Ivanov, Anatoli Kheifets, Xiaojun Liu, Andre Staudte and Markus Kitzler

AMP T07

Electronic pre-determination of ethylene fragmentation dynamics

AMP T08

Attosecond strong-field electron wavepacket interferometry

Xinhua Xie, Erik Lötstedt, Stefan Roither, Markus Schöffler, Sonia Erattupuzha, Daniil Kartashov, Gerhard Paulus, Atsushi Iwasaki, Andrius Baltuska, Kaoru Yamanouchi and Markus Kitzler

Xinhua Xie, Stefan Roither, Daniil Kartashov, Diego Arbó, Stefanie Gräfe, Andrius Baltuska, Joachim Burgdörfer and Markus Kitzler

16:30

Ende der Veranstaltung / End of session

17:00 18:30

Umtrunk und Ausstellungsbesuch ECHOPHYSICS

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau 19:00 20:00

Univ.-Prof. Dr. Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald A T01

Die Energiewende Deutschlands – wohin wird sie führen?

XI

Öffentliche Abendvorträge, Festsaal Schloss Pöllau Zeit time

ID

19:00 20:00

A T01

Öffentlicher Abendvortrag Mittwoch, 24.09.2014 Chair: NN Die Energiewende Deutschlands – wohin wird sie führen? Friedrich Wagner

Öffentlicher Abendvortrag Donnerstag, 25.09.2014 Chair: NN 19:30 20:30

A T02

Quantenphysik und Information Anton Zeilinger

Öffentlicher Abendvortrag Freitag, 26.09.2014 Chair: NN 19:30 20:30

A T03

Evolution gesehen durch die Brillen der Physiker und der Biologen Peter Schuster

Plenarsitzung / Plenary session Donnerstag/Thursday, 25.09.2014, 9-18, Festsaal Schloss Pöllau

Zeit time

ID

09:00

PLE T01 ID

09:45

PLE T02

Plenarvortrag OGD Chair: Ulrike Diepold The small frontier: Imaging molecular functionality Klaus Kern

Plenarvortrag FKP Chair: NN Hunds-rule coupling and magnetism in technetium and chromium oxides Markus Aichhorn

10:30 10:59

Kaffeepause / Coffee break

XII

Ehrungen

11:00 12:14

Fritz Kohlrausch-Preis Max Auwärter-Preis Victor Franz Hess-Preis Anton Paar-Preis Preise für Fachbereichsarbeiten Team Internationale Physikolympiade Team International Young Physicists´ Tournament (IYPT)

ID 12:15

PLE T03

Plenarvortrag FAKT Chair: NN The PANDA experiment at FAIR Paul Bühler

13:00 14:29

Mittagspause / Lunch break

14:30 15:30

ÖPG-Jahreshauptversammlung

15:30 15:59

Kaffeepause / Coffee break ID

16:00

PR T01

Preisträgervortrag Fritz Kohlrausch-Preis Chair: NN Water’ s second glass transition Katrin Amann-Winkel

ID 16:30

PR T02

Preisträgervortrag Max Auwärter-Preis Chair: NN From ultrathin perovskites to oxide quasicrystals Stefan Förster

ID 17:00

PR T03

Preisträgervortrag Victor Franz Hess-Preis Chair: NN Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3 Susanne Friedreich

17:30

PLE T04

Projekt: „Coole Physik“ Erich Gornik, Christian Fabjan, Walter Kutschera, Leo Ludick und Leopold Mathelitsch

18:00 19:30

Posterpräsentationen, Schloss Pöllau

19:30 20:30

Öffentlicher Abendvortrag, Festsaal Schloss Pöllau Univ.-Prof. Dr. Anton Zeilinger Universität Wien & Österreichische Akademie der Wissenschaften, Wien

COND, FAKT, Astro/ExoLife

A T02

Quantenphysik und Information

XIII

LHS Donnerstag/Thursday, 25.09.2014, 14-17:50, Refektorium Physik und Schule Chair: NN

Zeit time

ID

14:00

LHS T01

„Verborgene Schätze“: historische physikalische Geräte in Physik-Kabinetten

14:20

LHS T02

Rundblick über physikalische Kulturgüter in Sammlungen an alten Höheren Schulen Österreichs

Armin Denoth

Leopold Stadler

14:40

15:00

LHS T03 LHS 11

Projekt: „Coole Physik“ Leopold Mathelitsch, Christian Fabjan, Erich Gornik, Walter Kutschera und Leo Ludick

Interferometrie von Materiewellen Julia Salapa Akademisches Gymnasium Wien (Betreuung: Dr. Erwin Kronberger)

15:15

LHS 12

Die Automatisierung einer Carrera-Rennbahn Michael Fellner BRG Wörgl (Betreuung: Mag. Christian Pronegg)

15:30 15:59 16:00

Kaffeepause / Coffee break LHS 13

Von Lasern und Legierungen Philipp Haim BRG Wels (Betreuung: Mag. Petra Kragl)

16:15

LHS 14

Die Möglichkeiten des 3D-Drucks mit dem Verfahren des Fused Deposition Modeling anhand des RepRap Prusa Mendel I2 Benjamin von Berg Keplergymnasium Graz (Betreuung: Dr. Leander Brandl)

16:30

LHS T04

From “The Big Bang Theory” to Young High-Potentials education in physics Johannes Leitner, Ruth-Sophie Taubner, Maria Firneis and Regina Hitzenberger

16:50

Physik-Olympiade

17:05

International Young Physicists´ Tournament

17:20 17:50

Geschäftssitzung des Fachbereichs (Neuwahl der Vorsitzenden)

XIV

CiP Donnerstag/Thursday, 25.09.2014, 16-17:20, Festsaal Raika CIP Chair: Doris Steinmüller-Nethl

Zeit time

ID

16:00

CIP T01

16:20

CIP T02

Am Anfang war alles leicht

16:40

CIP T03

Mut zur Selbstständigkeit – realistisch oder blauäugig?

17:00

CIP T04

On-boarding: Worauf neue Mitarbeiter im Unternehmen achten [soll(t)en]

Bachelor, Master oder Dissertation – und was nachher? Elisabeth Schwab and Josef Siess

Richard Zemann

Doris Steinmüller-Nethl

Josef Siess and Elisabeth Schwab

17:20

Ende der Veranstaltung / End of session

Astro/ExoLife Poster Donnerstag/Thursday, 25.09.2014, Schloss Pöllau, 18:00-19:30 ID EXOL P01

Astro/ExoLife Poster Chair: NN Including new Cassini’s Gravity Measurements into Interior Structure Models of Enceladus Ruth-Sophie Taubner, Johannes Leitner, Maria Firneis and Regina Hitzenberger

EXOL P02

Hotspots and the Heat Budget of Venus Elisabeth Fahrngruber, Johannes Leitner and Maria Firneis

EXOL P03

Possible Water Flow Interaction of Rivers, Lakes and Oceans on Mars

EXOL P04

Estimating the Relative Age of Polygonal Impact Craters on Venus

Gabor-Imre Kiss, Johannes Leitner and Maria Firneis

Gerhard Weihs, Johannes Leitner and Maria Firneis

Pöllauer Tage der Physikgeschichte „Und dennoch bewegen sie sich …“ – BoltzmannTagung Freitag/Friday, 26.09.2014, 9-17:30, Refektorium Schloss Pöllau

XV

Boltzmann-Tagung Chair: Peter Maria Schuster

Zeit time

ID

09:00

B T01

Maxwell’s Dämon: Seine Historie und Entzauberung im Wechselspiel von Thermodynamik und Informationswissenschaften

09:45

B T02

Irreversibilität: von der Boltzmanngleichung zu den Fluktuationstheoremen

Heinz Krenn

Christoph Dellago

10:30 10:59

Kaffeepause / Coffee break

Zeit time

ID

11:00

B T03

Boltzmann-Tagung Chair: Walter Kutschera Josef Stefan, Revolutionär und Pionier der Atomistik der Materie – Wege zum Verständnis der Bewegung der Atome Gero Vogl

11:45

B T04

Die „Perle“ Stefan-Boltzmann-Gesetz Heinrich Mitter

12:30 13:59

Mittagspause / Lunch break

Zeit time

ID

14:00

B T05

14:45

B T06

Boltzmann-Tagung Chair: Heinz Krenn Geschichte der Atomhypothese Sonja Draxler and Max E. Lippitsch

Entropie ohne Atome Jakob Yngvason

15:30 15:59

Kaffeepause / Coffee break

Zeit time

ID

16:00

B T07

Boltzmann-Tagung Chair: Jakob Yngvason Das Sortieren von Atomen „One by One“ - Boltzmanns Vermächtnis in der Massenspektrometrie Walter Kutschera

16:45

B T08

Evolution der Kooperation Karl Sigmund

Ende der Veranstaltung / End of session

17:30 18:00 19:15

Umtrunk und Ausstellungsbesuch ECHOPHYSICS

19:30 20:30 A T03

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau Univ.-Prof. Dr. Peter Schuster Institut für Theoretische Chemie, Universität Wien Evolution gesehen durch die Brillen der Physiker und der Biologen

XVI

GEP Samstag/Saturday, 27.09.2014, 9-13, Refektorium Schloss Pöllau GEP Chair: Peter M. Schuster

Zeit time

ID

09:00

GEP T01

Die ersten Galvanometer in der Zeit 1820 bis 1840

09:30

GEP T02

Medizinische Physik – Physik im Dienste der Medizin. Der österreichische Medizinphysiker Dr. Fritz Hawliczek

10:00

GEP T03

Halbleiter-Dioden zur Detektion von Radarsignalen – Entwicklung in den USA und in Deutschland 1940- 1948

Franz Sachslehner

Werner Schmidt and Ferdinand Steger

Franz Pichler

10:30 10:59

Kaffeepause / Coffee break GEP Chair: Heinz Krenn

Zeit time

ID

11:00

GEP T04

11:30

GEP T05

Peter Salcher – Other works carried out in Fiume (Rijeka)

12:00

GEP T06

Case study of solar eclipse occurred on 10th July 1600

12:30

GEP T07

Experimentally verified violation of the law of reflection directly disproves length-contraction

Meteorologische Forschung an der Universität Graz während des 2. Weltkriegs Bruno Besser

Ana Alebić-Juretić

Mohammed Boudjada and Bruno Besser

Karl Mocnik

13:00

Ende der Veranstaltung / End of session

13:15 – 14:15

Ausstellungsbesuch ECHOPHYSICS

XVII

XVIII

Tagungsinformationen Tagungssekretariat Alle TeilnehmerInnen melden sich bitte vor dem Besuch der ersten Veranstaltung bei einem der nachfolgend angegebenen Sekretariate an. Sie erhalten dort Ihr Namensschild und den Tagungsband sowie allfällige weitere Unterlagen und können dort die Tagungsgebühr, falls noch nicht entrichtet, bezahlen. Wichtig: Ohne Namensschild ist der Zutritt zu den ÖPG-Veranstaltungen nicht möglich (ausgenommen sind die öffentlichen Abendvorträge und die Boltzmann-Tagung am Freitag, den 26. September). Das Haupt-Tagungssekretariat (Frau Serena Oldeboom, Oliver Schuster) befindet sich für die Dauer der ÖPG-Jahrestagung im 2. Stock des Schlosses, im Gang vor dem Festsaal. Den Raumplan des Schlosses und den Ortsplan finden Sie am Ende des Tagungsbandes. Öffnungszeiten: Mi – Sa, 24.– 27. September, jeweils 09:00 – 19:00. Dieses Hauupsekretariat ist zuständig für die KollegInnen, die am Mittwoch den 24. September die Sitzung COND im Refektorium besuchen; für die KollegInnen, die am selbigen Mittwoch die Sitzung AMP im Festsaal der Sparkasse besuchen; für die TeilnehmerInnen der Sitzung CM am Donnerstag (25. September) im Festsaal der Sparkasse; für die TeilnehmerInnen der Sitzung LHS am selbigen Donnerstag im Refektorium. KollegInnen, die am Mi, den 24.9., mit dem Bus aus Graz oder Wien anreisen, wird der Busfahrer die Namensschilder und den Tagungsband austeilen, vorausgesetzt, sie sind als TeilnehmerInnen und Fahrgäste angemeldet.

Hörsäle In allen Hörsälen stehen Laptop und Beamer zur Verfügung. Bitte bringen Sie Ihren Beitrag auf USB Stick/CD und, bei Bedarf, Ihren eigenen Laptop samt Adaptern mit.

Postersession Die Posterpräsentationen COND, FAKT, Astro/Exolife finden am Donnerstag (25. September) von 18:00 bis 19:30 im Gang vor dem Refektorium des Schlosses im 1. Stock statt. Die Posterwände sind entsprechend diesem Programm nummeriert, sodass jeder Teilnehmer „seine“ Wand leicht finden sollte. Alle Poster sollten am Mittwoch sowie Donnerstag hängen bleiben. Die Posterwände werden ab 09:00 mittwochs im Gang vor dem Refektorium des Schlosses im 1. Stock aufgestellt sein. Der Abbau der Poster kann auch noch bis Samstag (27. September) erfolgen, um die Poster den TeilnehmerInnen der Session GEP, bzw. BesucherInnen der Boltzmann-Tagung darzubieten (Maximale Postergröße: A-null-Hochformat).

XIX

Zahlung Falls die Tagungsgebühren nicht bereits im Voraus bezahlt wurden, können Sie an einem der beiden Tagungssekretariate in bar einzahlen. Kreditkarten oder Bankomatkarten werden nicht akzeptiert. Achtung: Einbezahlte Tagungsgebühren können nicht zurückerstattet werden. bis zum 31.07.2014 120,00

nach dem 31.07.2014 140,00

Mitglied von ÖPG, DPG oder SPG

90,00

110,00

Doktorand; Nicht-Mitglied von ÖPG, DPG oder SPG

90,00

110,00

Doktorand; Mitglied von ÖPG, DPG oder SPG

70,00

90,00

Teilnahmegebühren (alle Preise in Euro): Reguläre Teilnahme (Nicht-ÖPG/DPG/SPG-Mitglied)

Studierende(r) ohne Master-/Diplom-Abschluss

30,00

50,00

Tageskarte - 24.09.2014

30,00

50,00

Tageskarte - 25.09.2014

30,00

50,00

Tageskarte - 26./27.09.2014

30,00

50,00

Eingeladene(r) Vortragende(r) oder Funktionär

0,00

0,00

Begleitperson; kein Zutritt zu nicht-öffentlichen Sessions

0,00

0,00

bis zum 31.07.2014 20,00

nach dem 31.07.2014 20,00

10,00

10,00

Zusatz-Angebote: Bus-Transfer Wien - Pöllau - Wien Bus-Transfer Wien - Pöllau - Wien (Studierende) Bus-Transfer Graz - Pöllau - Graz

20,00

20,00

Bus-Transfer Graz - Pöllau - Graz (Studierende)

10,00

10,00

Konferenzdinner am 24.09.2014 mit lokalem Bus-Transfer

30,00

30,00

Konferenzdinner am 24.09.2014 ohne lokalen Bus-Transfer

27,00

27,00

Bus-Transfer Wien - Pöllau - Wien + Konferenzdinner

50,00

50,00

Bus-Transfer Wien - Pöllau - Wien + Konferenzdinner (Studierende)

40,00

40,00

Bus-Transfer Graz - Pöllau - Graz + Konferenzdinner

50,00

50,00

Bus-Transfer Graz - Pöllau - Graz + Konferenzdinner (Studierende)

40,00

40,00

XX

Kaffeepausen Die Kaffeepausen für die TeilnehmerInnen der Sitzungen im Schloss (COND, LHS) finden von Donnerstag bis Samstag im 2. Stock des Schlosses im Gang vor dem Festsaal statt. Den Raumplan des Schlosses finden Sie am Ende des Tagungsbandes. Für die TeilnehmerInnen der Sitzungen in den Festsälen der RAIKA und der Sparkasse wird jeweils vor diesen Festsälen in den Kaffeepausen ein kleines Buffet vorbereitet. Den Ortsplan finden Sie am Ende des Tagungsbandes. Der zur Postersession gehörende Apéro am Donnerstag von 18:00 bis 19:30, (vor dem Vortrag von Präsident Zeilinger), findet sowohl bei der Postersession am Gang vor dem Refektorium im 1. Stock, als auch vor den Händlerausstellung und dem Festsaal im 2. Stock statt.

Mittagessen Für das Mittagessen haben wir vier Gasthöfe im Ortsplan am Ende des Tagungsbandes angegeben. Alle vier Gasthöfe in Pöllau werden Menüs zu einem einheitlichen Preis anbieten. Wir werden vor jedem der Sitzungssäle eine Information aushängen, wo Sie, falls gewünscht, Menü und Gasthof Ihrer Wahl angeben können. Wir werden diese Informationen täglich bis 10:00 einsammeln und den Gasthöfen zustellen, damit die Mahlzeiten Ihnen zügig serviert werden.

Abendessen Das Konferenz-Abendessen (EUR 27,00/Person) findet am Mittwoch ( 24. September ab 20:30) im Gasthof König am Pöllauberg statt. Für den Transfer wird ein Bus organisiert. Der Preis für das Abendessen inklusive Busfahrten beträgt EUR 30,00/Person. Bis Mittwoch um 12:00 können Abendessen bzw. Busfahrt noch in den Tagungssekretariaten gebucht werden.

Internetzugang Im Festsaal sowie im Refektorium steht den TeilnehmerInnen kostenfreies WLAN zur Verfügung. Die Zugangsdaten sind wie folgt: Networkname

Passwort

Festsaal Refektorium

saal1 saal2

Übernachtungen Bei Problemen fragen Sie bitte im Haupttagungssekretariat im Schloss bei Frau Oldeboom an, die für die ÖPG zur Verfügung stehenden Zimmer informiert ist. Sonst wenden Sie sich bitte an den Tourismusverband Pöllauer Tal, der sein Büro im Schlossgebäude hat, direkt vor dem Kirchentor, Tel.: 03335-4210.

XXI

XXII

Österreichische Physikalische Gesellschaft 64. Jahrestagung

24.–27. September 2014 ECHOPHYSICS – Europäisches Zentrum f. Physikgeschichte Schloss 1, 8225 Pöllau b. Hartberg, Steiermark

Inhaltsverzeichnis Energietag 2014.................................................... 1 COND .................................................................... 5 COND Poster ..................................................... 23 FAKT .................................................................... 29 FAKT Poster....................................................... 37 AMP...................................................................... 43 Öffentliche Abendvorträge ................................... 47 Plenarsitzung / Plenary session........................... 49 LHS ...................................................................... 53 CiP ....................................................................... 57 Astro/ExoLife Poster ............................................ 59 Pöllauer Tage der Physikgeschichte ..................... 61 GEP ...................................................................... 65

Energietag 2014 Mittwoch/Wednesday, 24.09.2014, 10-16:45, Festsaal Schloss Pöllau

Zeit time

ID

Eröffnung der Veranstaltung und Begrüßung der Gäste / Opening of the event and welcoming of participants

10:00 10:15

Vortrag / Presentation

E T01

Historical aspects of the concept of energy Alessandro Pascolini Università di Padova, Dipartimento di Fisica, Padova, Italy The presentation aims at introducing the interplay of different disciplines and philosophical attitudes which lead to the concept of energy in the first half of the XIX century, and to the following reshaping of the whole physics centred on the new concept. The establishment of the principle of energy conservation was a crucial point for the conception and clear definition of energy, and the achievement of the principle was a result of concurring developments in mechanics, chemistry, electricity, thermology, magnetism, physiology, the engineering of machines, developments made also possible by the increase of precision of scientific instruments and the professionalization of scientist. The role of the extension of the methods of mathematical physics from the real of mechanics to new scientific fields will also be considered, together with the changes in the cultural milieu and in the basic philosophical tenets on nature.

11:00

E T02

Energie, Wirtschaft und Gesellschaft: eine Zeitreise Werner Watzenig KELAG – Kärntner Elektrizitäts-Aktiengesellschaft, Klagenfurt Der Energieverbrauch des Menschen hat sich im Laufe seiner Geschichte verzehnfacht. In der Antike waren tierische und menschliche Muskelkraft die wichtigste Energiequelle. Es folgten ab dem Spätmittelalter Wasser- und Windräder. Dennoch blieben menschliche und tierische Muskelkraft weiterhin die wichtigste, effektivste und billigste Energiequelle. Dampfmaschinen ersetzten im 18. Jahrhundert den Wasserradantrieb für mechanische Arbeiten in Textilbetrieben, in der Eisenbearbeitung und im Bergbau. Die Industrialisierung veränderte seit dem 19. Jahrhundert soziale, gesellschaftliche, wirtschaftliche und politische Strukturen. Dampfmaschinen und Kohle ermöglichten den Bau von Fabriken im Nahbereich der Städte. Kohle wurde zum bedeutendsten Energieträger der Industrie. Kohlereviere wurden wichtige Industriestandorte. Das Erdölzeitalter ermöglichte nach dem Einsatz in Dampfmaschinen und Dampflokomotiven, den Siegeszug in den Verbrennungsmotoren für Automobile. Die Wende in der Erdölpolitik trat nach den Krisen 1973 und 1979 ein. Im letzten Drittel des 19. Jahrhunderts entwickelte sich die Elektroindustrie. Im 20. Jahrhundert konnten Betriebe für immer mehr und neue Industrien an beliebig neuen Standorten gegründet und mit elektrischer Energie versorgt werden.

11:45 12:14

Kaffeepause / Coffee break

1

12:15

E T03

Zur Geschichte der Mobilität – Entwicklung, Barrieren und Chancen Harald Frey Österreichische Verkehrswissenschaftliche Gesellschaft, Wien Die Geschichte der Mobilität reicht weit über jene der menschlichen Fortbewegung zurück. Kenntnis und Verständnis über Gesetzmäßigkeiten und Wirkungsmechanismen von Mobilität erlangen wir durch einen Blick auf die Evolution. Der effiziente und zweckmäßige Umgang mit Energie kann als Prinzip der Entwicklung definiert werden. Mobilität war und ist immer mit Energieaufwand verbunden. Die Entwicklung von Siedlungen und Städten waren unmittelbarer Ausdruck der Minimierung von Mobilitätsenergie. Alle wesentlichen Grundbedürfnisse konnten in der Nähe oder in unmittelbarer Nähe erfüllt werden. Als nah galt, was in kurzer Zeit zu Fuß erreicht werden konnten und die Ausdehnung der geschlossenen Siedlungsbereiche orientierte sich an diesen Entfernungen. Mit der Nutzung externer Energiequellen erhöhten sich die Geschwindigkeiten und zurückgelegten Entfernungen im Verkehrssystem. Prozesse der Zersiedelung und Konzentration, die heute vielfach auf der Symptomebene diskutiert werden, führen zu neuen Abhängigkeiten und Barrieren. Chancen, die durch das Erkennen dieser künstlich geschaffenen Zwänge genutzt werden, bilden die Grundlage für einen Paradigmenwechsel in der Praxis der Verkehrs- und Siedlungsplanung.

13:00 14:29 14:30

Mittagspause / Lunch break E T04

Erdgasversorgung in Österreich Andreas Lederbauer OMV Gas Storage GmbH, Wien Erdgas stellt einen wichtigen Beitrag zur Energieversorgung dar und gilt als der sauberste unter den fossilen Energieträgern. In Österreich wird Erdgas überwiegend als Wärmeenergie zum Heizen, für die Stromproduktion oder auch als Kraftstoff verwendet. Das russische Importgas wird üblicherweise bandförmig über Pipelinesysteme nach Österreich transportiert und im Sommer, wenn der Bedarf niedrig ist, in ausgeförderten Erdgaslagerstätten gespeichert. Die OMV Erdgasspeicher in Österreich und Deutschland gleichen vor allem saisonale Verbrauchsschwankungen aus und können gemeinsam rund 3 Milliarden Kubikmeter Erdgas aufnehmen. In Österreich liegen die OMV Speicher am Knotenpunkt großer Transitpipeline-Systeme (Baumgarten). In Deutschland ist der OMV Erdgasspeicher sowohl an das niederländische (GTS) wie auch an die deutschen (NCG, Gaspool) Marktgebiete angebunden und bietet den Kunden somit höchste Flexibilität. Ab Ende 2016 soll zur weiteren Versorgungssicherheit der österreichische Teil des russischen Pipelineprojektes „South Stream“, mit einer jährlichen Transportkapazität von 30 bis 32 Milliarden Kubikmeter Gas, von der ungarischen Grenze bis zum Endpunkt nach Baumgarten verlaufen.“

15:15

E T05

Wegkreuzungen mit Information und Kommunikation Helmut Malleck TU Graz, Institut für Elektrische Anlagen, Graz Die Bewältigung des Unerwarteten war zu allen Zeiten, insbesondere in Zeiten technologischer, wirtschaftlicher, ökologischer, soziologischer und politischer Veränderung, eine strategische Herausforderung für die Menschen. Ermöglicht wird die Orientierung an historischen Wegkreuzungen durch den Einsatz von Informationsund Kommunikationstechnik. Nicht zuletzt durch die Bereitstellung elektrischer Energie wurden die dabei eingesetzten Methoden wirksam und sind nunmehr auch massentauglich. Ausgehend von den historischen Wurzeln werden im Vortrag herausragende Entwicklungen in der Informations- und Kommunikationstechnik des 20. Jahrhunderts betrachtet sowie eine mögliche Extrapolation in die nähere und fernere Zukunft gegeben.

2

16:00

E T06

Geschichte der Kernenergie Helmuth Böck TU Wien, Atominstitut, Wien Ab den frühen 50er Jahren begann die eigentliche Entwicklung der Kernenergie zur friedlichen Nutzung für Forschung und Energieerzeugung. Es wurde schon zu diesem Zeitpunkt erkannt, dass eine übergeordnete internationale Organisation eine Kontrollfunktion für Spaltmaterial ausüben muss, diese wurde 1957 als IAEO (Internationale Atomenergie Organisation) mit Sitz in Wien gegründet. Seither erfolgte zuerst eine sehr intensive Entwicklung und der Bau von zahlreichen Kernkraftwerken (KKW) und Forschungsreaktoren, der Ausbau verlangsamte sich nach den Unfällen von Three Mile Island und Tschernobyl. Mit Ende 2013 sind weltweit 437 KKW in 31 Ländern in Betrieb und 70 KKWs in Bau, vor allem in Mittleren- und Fernen Osten. Der Vortrag gibt einen Überblick zur Entwicklung der Kernenergie für friedliche Zwecke, diskutiert die Auswirkung der Störfälle und beleuchtet die aktuelle Situation von Endlagerprojekten.

16:45

Ende der Veranstaltung / End of the event

17:00 18:30

Umtrunk und Ausstellungsbesuch ECHOPHYSICS

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau Univ.-Prof. Dr. Friedrich Wagner 19:00 20:00

Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald A T01

Die Energiewende Deutschlands – wohin wird sie führen? Die „Energiewende“ Deutschlands ist ein politisch und gesellschaftlich gewollter Technologiewechsel in der Erzeugung, Verteilung und Nutzung von Energie. Die neue Technologie für Stromerzeugung basiert vornehmlich auf Wind und Sonne mit Folgen, die nicht oder wenig in der öffentlichen Diskussion genannt werden. Es liegt in der Bringschuld der Forschung, sich um weitergehende Aufklärung zu bemühen. Deutschland verfügt nun in der Summe über etwa 70 GW an installierter Leistung für Strom aus Wind- und Photovoltaik (PV)*-Kraftwerken. Der Stromverbrauch in Deutschland schwankt zwischen 35 und 85 GW. Aus dem Betrieb dieser Anlagen hat sich eine gute Datenbasis ergeben, um von den derzeitigen Beiträgen der Erneuerbaren Energien (EE) auf die Merkmale einer 100% Versorgung schließen zu können. Grundlage für diese Extrapolation sind die Daten von 2012, die in guter zeitlicher Auflösung für Bedarf, onshoreund offshore Wind und die PV Einspeisung vorliegen. Für eine 100%-Versorgung wird die gesamte installierte Leistung berechnet. Dabei ergeben sich Perioden mit Überschuss und solche, in denen der Strombedarf nicht durch die EE-Installationen abgedeckt wird, also weiterhin thermische Kraftwerke – Kohle-, Gas- oder Kernkraftwerke – benötigt werden. Deren Kapazität wird ermittelt. Das Verhältnis von Wind zu PV Leistung ergibt sich aus der Forderung, die verbleibende Kapazität an thermischer Leistung zu minimieren. Die Betriebsbedingungen für die thermischen Kraftwerke ändern sich: derzeit werden sie von der Dynamik des Verbrauchs, in der Zukunft von der der prioritären Erzeugung durch EE bestimmt. Die äußeren Betriebsbedingungen für diese Kraftwerke werden analysiert. Sobald taugliche Speichertechniken entwickelt sind, kann der Überschuss in Speichern genutzt werden und damit die thermischen Kraftwerke ersetzen. Speicherumfang und –betrieb lassen sich definieren und charakterisieren. Es wird generell erwartet, dass in einem gewissen Maß Lastanpassung erfolgt, dass also über den Strompreis die Nachfrage an die Verfügbarkeit angepasst wird. Die Randbedingungen dafür werden aufgezeigt. Letztlich wird die CO2-Produktion bei der Stromversorgung, die ja ein wesentliches Motiv für die „Energiewende“ ist, analysiert und mit der anderer Länder verglichen. Das Problem einer Versorgung mit Wind und Sonne ist die erratische Natur der Produktion. Schwankungen können zum Teil ausgemittelt werden über die Stromeinspeisung in ein europäisches Gesamtnetz aus Regionen mit unterschiedlichen Wetterbedingungen. Inwieweit sich damit die wesentlichen Charakteristiken einer Stromversorgung vornehmlich aus Wind und Sonne einfacher gestalten lassen, wird im Vortrag gezeigt. * In PV Anlagen wird das Sonnenlicht direkt über den sog. Photoeffekt in Strom umgewandelt.

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COND Mittwoch/Wednesday, 24.09.2014, 10-13, 14-18:30, Refektorium

Zeit time

ID

10:00

CM T11

COND, Session 1 Chair: Ulrike Diebold Functional molecules on surfaces: From conducting wires to the role of single atoms Leonhard Grill University of Graz, Department of Physical Chemistry, Heinrichstrasse 28, 8010 Graz Functional molecules on surfaces and their assembly into pre-defined architectures are key challenges in nanotechnology and of interest in various fields from molecular electronics over novel materials to molecular machines. Various examples of functional molecules, studied by scanning tunneling microscopy (STM) under ultrahigh vacuum conditions will be discussed. Specifically designed molecular building blocks are connected to twodimensional networks or one-dimensional chains, which can act as molecular wires. On the other hand, chemical processes within individual molecular can be controlled via their environment. This was observed for molecular switches, where the atomic-scale surroundings cause drastic changes in their switching probability. Recently, we could show that the rate of an intramolecular hydrogen transfer reaction can be tuned up and down by single atoms in the vicinity of the molecule. Single atoms were also found to modify the appearance of adsorbed molecules in STM images during their diffusion underneath the molecules. Finally, a combination of the two approaches will be discussed, potentially leading to heterogeneous molecular nanostructures that contain functional molecules.

10:30

CM T12

Ordered Indium adatoms on the reduced In2O3(111) surface Margareta Wagner, Steffen Seiler, Bernd Meyer, Lynn A. Boatner, Michael Schmid and Ulrike Diebold TU Wien, Institut für Angewandte Physik, Wiedner Hauptstrasse 8-10/134, 1040 Wien Indium oxide is one of the most important TCOs and commonly used as a contact material in LEDs, photovoltaic cells or liquid crystal displays. Recently, In2O3 single crystals have become available; such samples are a prerequisite for fundamental surface studies. The In2O3(111) surface can be transformed from an oxidized, bulk-terminated surface to one that is covered by single indium adatoms. As each adatom sits at one specific site within the surface unit cell they form a well-ordered (1 × 1) superstructure. Annealing at 500°C in O2 or in ultrahigh vacuum results in a fully reversible conversion between these two surface terminations; this transformation and the intermediate stages were followed with Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT). DFT supports the formation of a stable array made of indium adatoms, which is favored over vacancy formation at the given oxygen chemical potential during reduction. The formation of an ordered adatom array is different from any known response of an oxide surface to chemical reduction. The adatom-covered and oxidized In2O3(111) surfaces are expected to exhibit very different chemical and electronic properties, which can easily be exploited by the facile and reversible switching between the two terminations.

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10:45

CM T13

Growth and characterization of the p-type transparent conducting oxide ZnCo2O4 Bastian Henne, Verena Ney, Fabrice Wilhelm, Katharina Ollefs, Andrei Rogalev and Andreas Ney Johannes Kepler Universität Linz, Institut für Halbleiter- und Festkörperphysik, Altenberger Strasse 69, 4040 Linz Transparent conducting oxides (TCOs) are astonishing materials due to their unique optical and electrical properties and their wide range of possible applications. One of these systems is the ZnCo2O4 spinel. Although known for some time only very little effort has been made to investigate the magnetic properties [1]. As a known p-type material, ZnCo2O4 is a promising candidate for ferromagnetism in oxide semiconductors, since the lack of p-type dopability is one of the major limitations in the related system Co:ZnO, which was proposed as a possible room temperature dilute magnetic semiconductor [2]. As secondary phase ZnCo2O4 in Co:ZnO has furthermore been suspected as the reason for the observed ferromagnetism [3]. We present the successful growth of crystalline ZnCo2O4 thin films by means of magnetron sputtering on c-plane sapphire substrates. Additional samples were fabricated to study the transition from highly cobalt doped n-type wurtzite ZnO to the cubic p-type ZnCo2O4 in dependence of preparation conditions. Standard characterization using SQUID magnetometry, XRD, AFM and TEM has been done and the transport properties of the thin films have been measured. Additionally, the samples were investigated using element specific synchrotron techniques like x-ray absorption near edge structure spectroscopy (XANES) and x-ray linear dichroism (XLD) to determine the valence of the Co and to exclude metallic aggregations. High field x-ray magnetic circular dichroism (XMCD) was used to quantify the behavior of the Co sublattice magnetization up to 17 T. Magnetic ordering below ~12 K was observed in SQUID and the low temperature M(H)-hystereses show history dependent behavior being reminiscent of exchange bias. [1] Kim, H. J., et al. physica status solidi (b) 241 (2004): 1553 [2] Dietl, T., et al. Science 287 (2000): 1019 [3] Liu, Y. and MacManus-Driscoll, J.L. Applied Physics Letters 94 (2009): 022503

11:00

CM T14

The structure of the Fe3O4(001) surface Roland Bliem, Eamon McDermott, Pascal Ferstl, Oscar Gamba, M. Alexander Schneider, Michael Schmid, Peter Blaha, Ulrike Diebold, Lutz Hammer and Gareth Parkinson Vienna University of Technology, Institute for Applied Physics, Wiedner Hauptstrasse 8-10/134, 1040 Vienna The Fe3O4(001) surface exhibits a (√2⨉√2)R45° reconstruction characterized by the observation of undulating rows of Fe atoms in scanning tunnelling microscopy images. The existing model for the surface is a “polar” bulk truncation stabilized by subtle lattice distortions that couple to subsurface charge ordering [1, 2]. In this presentation it will be shown that the current model fails to explain the adsorption behaviour of molecules and metal adatoms. We have solved the structure by quantitative LEED intensity analysis (Rp ~ 0.13, 40 beams, total database 11000 eV) and density functional theory calculations and found that the true structure, which explains all existing experimental observations for this surface, involves a major rearrangement of the Fe cations in the subsurface layer. [1] R. Pentcheva, F. Wendler, H.L. Meyerheim, W. Moritz, N. Jedrecy, M. Scheffler, Physical Review Letters 94 (2005) 126101. [2] Z. Lodziana, Physical Review Letters 99 (2007) 206402.

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11:15

CM T15

Adsorption of formic acid and Methanol on the Magnetite (001) surface Oscar Gamba, Roland Bliem, Heshmat Noei, Andreas Stierle, Michael Schmid, Ulrike Diebold and Gareth Parkinson Vienna University of Technology, Institute for Applied Physics, Wiedner Hauptstr. 8-10/134, 1040 Wien The study of surfaces and its interactions with organic molecules represent an important item in the research of diverse topics as catalysis, corrosion geochemistry and environmental science. Formic acid (HCOOH), the simplest carboxylic acid, and methanol (CH3OH), a simple alcohol, are often used as probe molecules to test the reactivity of metal oxide surfaces. Adsorption of both species can be molecular, as on the oxygen terminated [1], but is frequently dissociative on surfaces that expose pairs of under coordinated cations [2, 3]. Such adsorption is understood as an acid-base reaction; the acidic proton of the OH group is abstracted by a basic O2- anion, forming a OlatticeH species, while the remainder of the molecule, a formate (HCOO-) or methoxy (CH3O-) species, is bound at an acidic metal cation site [4]. The adsorption of formic acid and methanol on the Fe3O4(001) surface was studied using X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED), infrared reflection absorption spectroscopy (IRAS) and scanning tunneling microscopy (STM). Both molecules adsorb dissociatively at room temperature, yielding adsorbed formate and methoxy species respectively, together with surface hydroxyl groups. Formate adsorbs in a bidentate configuration at regular lattice sites producing a (1⨉1) overlayer. Methoxy adsorption is restricted to step edge and other defect sites where the coordinative undersaturation of the surface atoms is higher. [1] Vohs, J. M., and Barteau, M. A. (1986) Conversion of methanol, formaldehyde and formic acid on the polar faces of zinc oxide. Surface Science 176, 91-114 [2] Henderson, M. A. (1997) Complexity in the Decomposition of Formic Acid on the TiO2(110) Surface. The Journal of Physical Chemistry B 101, 221-229 [3] Pang, C. L., Lindsay, R., and Thornton, G. (2013) Structure of Clean and AdsorbateCovered Single-Crystal Rutile TiO2 Surfaces. Chemical Reviews 113, 3887-3948 [4] Vohs, J. M. (2012) Site Requirements for the Adsorption and Reaction of Oxygenates on Metal Oxide Surfaces. Chemical Reviews 113, 4136-4163

11:30 11:59

Kaffeepause / Coffee break

Zeit time

ID

12:00

CM T21

COND, Session 2 Chair: Adolf Winkler Enhancing the reactivity of a Perovskite surface: Deposition of Sr-adatoms and NiO-clusters onto SrTiO3(110)-(4×1) surface Stefan Gerhold, Zhiming Wang, Michele Riva, Xianfeng Hao, Cesare Franchini, Karina Schulte, Michael Schmid and Ulrike Diebold Vienna University of Technology, Wiedner Hauptstrasse 8-10/E134, 1040 Vienna The interaction of water with oxide surfaces has been studied extensively because of applications such as the water-gas-shift reaction [1] or the photocatalytic splitting of water [2]. In a previous study, we have investigated the adsorption of water on the clean, asprepared (4×1) surface of SrTiO3(110). We found that this surface is remarkably inert towards the interaction with water and proposed that surfaces consisting of tetrahedral units may show chemical inertness in general [3]. Recently, we have modified this surface by deposition of Sr adatoms or NiO clusters. Scanning tunneling microscopy (STM) showed that additional Sr on the (4×1) surface is stabilized as single adatoms. NiO islands, on the other hand, appear much more obscured in STM images and adopt a rectangular shape. Results from photoemission reveal that both, Sr-adatoms or NiO-clusters can facilitate water dissociation. In addition, the Sr-rich surface shows a strong downward band bending (BB), the formation of an in-gap state (IGS), as well as a reduction of the workfunction by 1.6 eV. For the NiO-modified surface, upward BB, no IGS and an increase in workfunction by 0.35 eV is observed. With the help of theoretical calculations, a possible dissociation mechanism on the Sr-rich surface was proposed. This work was supported by the Austrian Science Fund (FWF, project F45). [1] R. J. Smith, M. Loganathan, and M. S. Shantha, International Journal of Chemical Reactor Engineering 8, (2010). [2] T. K. Townsend, N. D. Browning, and F. E. Osterloh, Energy Environ. Sci. 5, 9543 (2012). [3] Z. Wang, X. Hao, S. Gerhold, Z. Novotný, C. Franchini, E. McDermott, K. Schulte, M. Schmid, and U. Diebold, J. Phys. Chem. C 117, 26060 (2013).

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12:15

CM T22

Development and character of gap states on alkali doping of Sexiphenyl films Eva M. Reinisch, Thomas Ules, Peter Puschnig, Stephen Berkebile, Markus Ostler, Thomas Seyller, Michael Ramsey and Georg Koller Universität Graz, Institut für Physik, Universitätsplatz 5, 8010 Graz In organic electronics, both the charge transport and the ability to inject charges at the metal contact are factors determining device performance. One way to tune these parameters is to expose the molecular film to alkali metals. This alkali metal doping causes severe modifications to both the molecular electronic structure and level alignment. In addition, the conductivity of the molecular films becomes enhanced, which is associated with new electronic states introduced into the former band gap. Here we study the alkali metal induced effects on an ordered and aligned Sexiphenyl monolayer on Cu(110) with angle-resolved UV spectroscopy (ARUPS). The caesium (Cs) induced gap states could clearly be identified by Orbital Tomography, a method based on ARUPS, which allows both the orbital character of these states and the molecular orientation to be determined. We show that with increasing the alkali metal dose, doping proceeds in three distinct steps. Initially, Cs decouples the molecular monolayer from the substrate, with emptying of the lowest unoccupied molecular orbital (LUMO) that had been filled on hybridization with the substrate. Further Cs exposure refills the LUMO. Finally a filling of the LUMO+1 by charge transfer from the alkali metal occurs. Remarkably, although long range order is not preserved and the molecular planes tilt away from the surface, the molecules remain aligned parallel to the [1-10] azimuth during the whole doping process.

12:30

CM T23

Alkali metal doped para-sexiphenyl monolayers and thin films on Al(110): an angle resolved UV photoemission study Hannes Offenbacher, Georg Koller, Thomas Ules, Eva Reinisch, Peter Puschnig and Michael Ramsey

University of Graz, Surface and Interface Division, Institute of Physics, Universitätsplatz 5, 8010 Graz The growth of para-Sexiphenyl (6P) mono- and multilayer films on an atomically clean Al(110) surface has been investigated by angle-resolved ultraviolet photoemission spectroscopy (ARUPS). The resulting oriented molecular films were consecutively doped with Cs. Al(110) was chosen as a substrate for two main reasons: a) aluminium is an interesting contact material in organic electronics and b) the lack of a d-band allows an undisdurbed view on the molecular orbitals and the changes upon alkali metal doping using ARUPS. For the undoped 6P monolayer on Al(110), ARUPS indicates lying, twisted molecules, oriented parallel to the atomic substrate rows. Cs deposition subsequently leads to electron charge transfer from the alkali metal to the molecular orbitals, filling first the LUMO, then LUMO+1, with increasing amounts of Cs. Electronically a shift of the former HOMO and HOMO-1 orbitals to lower binding energy is observed, while the deeper lying orbitals remain unaffected. This will be discussed in terms of intramolecular bond length changes upon alkali metal doping.

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12:45

CM T24

Organic thin film transistors under ultra-high vacuum conditions: Deposition and device temperature dependent in-situ electrical and surface analytical characterization Roman Lassnig, Michael Hollerer, Bernd Striedinger (2), Alexander Fian (2), Barbara Stadlober (2) and Adolf Winkler TU Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz (2) Institut für Oberflächentechnologien und Photonik, Joanneum Research, Graz Many of the underlying principles affecting critical organic field effect transistor (OFET) parameters such as performance and lifetime are not fully understood to the present date. In order to contribute a new approach to the diverse research on the topic, we present analysis on the formation, structure and stability of the semiconducting layer in OFETs, through a unique combination of in-situ layer deposition, real-time electrical and surface analytical characterization, during and subsequent to the deposition process itself, with all investigations being performed under ultra-high vacuum conditions at temperatures ranging from 125 K up to semiconductor desorption. To reach conclusions about the layer growth, in-situ Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) were performed parallel to the electrical investigations. Ex-situ atomic force microscopy allowed direct connections to be made between growth mode, morphology and charge transport mechanisms. Of special interest was the onset of the OTFT functionality as a function of layer thickness combined with sample pretreatment. In addition the evaluation of coverage and growth temperature dependent linear and saturation charge carrier mobilities proved to be of great interest in regard to contact resistance assessments. While all measurements have been performed on bottom-contact pentacene organic field effect transistors our experimental setup allows us to gain insight into the relationship between electrical parameters and layer morphology for a wide range of test devices and modifications.

13:00 13:59

Mittagspause / Lunch break

Zeit time

ID

14:00

CM T31

COND, Session 3 Chair: Peter Hadley Lattice simulation of Dirac fermions without fermion doubling: application to spintronics Rene Hammer Materials Center Leoben, Roseggerstraße 12, 8700 Leoben In the relatively new but extremely fast growing field of topological matter research, this thesis should contribute to the understanding of the behavior of the underlying quasiparticle: the Dirac fermion. For this purpose the reader gets a brief introduction to the emergence of relativistic quantum mechanics in solid state systems. The connection to the topological invariant and its indispensability in giving a unified description of the physics at topological defects like surfaces, domain-walls, and vortices is made. The main focus, however, lies in the description of the dynamical behavior of the Dirac fermion quasiparticle in this non-trivial spatial and, possibly, time dependent potential and mass landscapes. To allow an efficient numerical simulation, a new scheme is developed. Along the way, the famous fermion doubling problem is introduced, and avoided by a special time and space staggering of the numerical finite difference grid. Like in the underlying differential equation, this special discretization of the Dirac equation treats time and space on an equal footing. Schemes for (1+1)D, (2+1)D, and (3+1)D are formulated, and their numerical properties are derived. The important topic of open boundary conditions is discussed and, in the one-dimensional case, perfect absorbing boundary conditions (so-called discrete transparent boundary conditions) are derived. In (2+1)D absorbing boundary conditions, using imaginary potential regions, are introduced. On the applied physics side, the utilization of domain-wall fermions for dissipation-less electric circuits is proposed. Using these principles, an interferometer device which can be controlled by an electrical gate is envisioned and its working principle is shown numerically.

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14:30

CM T32

Modeling of Ohmic contacts of nano-devices within the Lindblad equation Walter Poetz Universität Graz, Universitätsplatz 5, 8010 Graz We discuss the modeling of Ohmic contacts, i.e. macroscopic particle reservoirs, in charge transport simulations for nanostructures within the Lindblad equation (LBE). Our strategies are related to the ones used in quantum optics: the concept of eigenstates and dark states of Lindblad operators. Starting from the LBE equation we give a general derivation of the relaxation-time ansatz into an arbitrary density matrix. Then we address more specifically the problem of charge injection from the contact into the nanostructure. The contact is modeled as a reservoir which injects free particles distributed according to a Fermi-Dirac distribution. Numerical examples are shown for the transport of Dirac fermions on topological insulator surfaces.

14:45

CM T33

First-principles investigation of crystalline topological insulators Pb1 xSnx(Se,Te) Kerstin Hummer, Marta Galicka, Ryszard Buczko and Georg Kresse University of Vienna, Computational Materials Physics, Sensengasse 8/12, 1090 Vienna The rather novel class of materials called 3-dimensional topological insulators (TI) reveals new exciting physics that are governed by time-reversal symmetry and strong relativistic effects (spin-orbit coupling) inducing band inversion in the band structure [1]. Due to these effects TIs exhibit bulk insulating states that are accompanied by metallic states on their surface with Dirac-like (linear) energy dispersion across the bulk band gap. These surface states are topologically protected by time reversal symmetry and become manifested in topologically non-trivial wave functions of the corresponding valence electrons. The most prominent materials belonging to the “next generation” 3-dimensional TI class are the VAVIA compounds Bi2(Te,Se)3. Apart from these materials, the existence of topological crystalline insulators (TCI) was recently suggested [2]. In the TCIs the symmetry of the crystal lattice replaces the role of time-reversal symmetry in ensuring the topological protection of the metallic surface states. In particular some IV-VI narrow-gap semiconductors show features of TCIs [3]. The discovery that solid solutions of lead and tin chalcogenides (selenides and tellurides) are perfect objects for the study of phase transition between the normal narrow-gap semiconductor state and topological crystalline insulator, started intensive studies of these materials, both experimental and theoretical. In this work, we focus on first principles investigation of the electronic properties of the ternary alloys Pb1 xSnx(Se,Te), in particular the dependence of the band gap and band inversion on the Sn content and the lattice constant. Accurate alloy band structures are obtained with the modified Becke-Johnson exchange potential using a supercell approach. [1] M. Z. Hasan and C. L. Kane, Rev. Mod. Phys. 82, 3045 (2010) [2] L. Fu, Phys. Rev. Lett. 106, 106802 (2011) [3] Y. Tanaka et al., Nature Phys. 8, 800 (2012); T. Hsieh et al., Nature Commun. 3, 982 (2012) [4] P. Dziawa et al., Nature Mater. 11, 1023 (2012)

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15:00

CM T34

Formation of mono- and bi-metallic nanowires in vortices in superfluid He nanodroplets Philipp Thaler, Alexander Volk, Florian Lackner, Johannes Steurer, Daniel Knez (2), Werner Grogger (2), Ferdinand Hofer (2) and Wolfgang E. Ernst TU Graz, Petersgasse 16, 8010 Graz (2) TU Graz, Institute for Electron Microscopy and Nanoanalyis, Steyrergasse 17, 8010 Graz The recent years have seen a tremendous growth of interest in one-dimensional nanostructures [1], accompanied by many new emerging applications ranging from nanoelectronics to material science, optics and catalysis. One-dimensional nanostructures and especially one dimensional core-shell systems exhibit novel and unexpected properties in terms of magnetism, catalysis or plasmon resonances. Additionally, controlling the size and composition of the nanostructures enables the deliberate tuning of these features. We present a new approach for the tailored formation of nanorods and nanowires as well as one-dimensional core-shell nanostructures on the example of Ag, Au and Ag/Au systems. Our approach exploits the agglomeration of dopant atoms and molecules along vortices inside superfluid helium nanodroplets. The existence of these vortices has been found only very recently [2], with great impact in nanoscience. In a first step the vortex-charged helium nanodroplets were used for the formation of mono-metallic nanorods and nanowires. Then, a sequential pickup scheme was employed to create bi-metallic core-shell nanostructures with a controlled material sequence. The element sensitive and spatially resolved energy dispersive X-ray spectroscopy (EDXS) technique was used to analyze the core-shell nanostructures and we were able to directly show their structure for the first time. Our results suggest that the helium droplet isolation approach allows the formation of exotic material combinations, which may lead to novel nanostructures exhibiting revolutionary properties. [1] L. Cademartiri and G. A. Ozin, Adv. Mat. 21, 1013 (2009) [2] L. F. Gomez, E. Loginov, and A. F. Vilesov, Phys. Rev. Lett. 108, 155302 (2012)

15:15

CM T35

HR-STEM investigations of metallic nanoparticles grown with superfluid He-droplets Daniel Knez, Philipp Thaler (2), Alexander Volk (2), Werner Grogger (2), Wolfgang E. Ernst (2) and Ferdinand Hofer TU Graz, Institute for Electron Microscopy and Nanoanalyis, Steyrergasse 17, 8010 Graz (2) TU Graz, Petersgasse 16, 8010 Graz Metallic nanoparticles have attracted more and more interest in recent years as they exhibit completely new physical and chemical properties compared to bulk materials. Over the years numerous synthesis methods, mostly based on wet chemical processes, pyrolysis or evaporation have been developed. In contrast, the nanoparticles used for our investigations were synthesized by using superfluid helium nanodroplets at around 0.3 K under ultra-high vacuum (UHV) conditions. This approach provides exceptional advantages over conventional methods like sequential addition of a wide range of materials. Thus, nanoparticles can be synthesized with any composition and different structures, with extremely high purity, which cannot be achieved by other known methods. Knowledge of the morphology, dimension and composition of the produced particles are not only essential for understanding their physical and chemical properties, but also for the optimization of the synthesis parameters. By using a probe corrected, monochromated FEI Titan 60-300 equipped with a Super-X detector (EDX) and a Gatan Quantum energy filter we performed analytical high resolution STEM (HR-STEM) in order to characterize metal nanoparticles with respect to their morphology and chemistry. Bimetallic nanowires with a gold-silver coreshell structure were synthesized in one of our Experiments. We showed that they grew from single spherical particles inside the He droplet. Elemental analysis of the nanoparticles by EELS and EDX clearly revealed that Ag and Au, which were added to the droplet sequentially, are not alloyed. Finally, the nano-optical properties of these metallic clusters will be studied via low-loss EELS measurements in the plasmon regime, which depend on their size, structure and morphology. In order to quantify the influence of the underlying substrate, we will also compare conventional carbon films with mechanical exfoliated monolayer substrates (graphene and hexagonal boron nitride).

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15:30

CM T36

Investigations of defects in semiconductors Martin Faccinelli, Stefan Kirnstoetter and Peter Hadley TU Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz The electrical properties of semiconductors are easily changed by varying the concentration of certain defects in these materials. The structure and composition of such defects depend on various influences during the semiconductor manufacturing. To be able to estimate and also to simulate the changes of the material properties due to the presence of defects, it is crucial to know the structure of these defects and also to measure their concentration. In our research group, we work on finding new ways of characterizing defects and on the improvement of established methods used in semiconductor analysis. Our main focus lies on the electron beam induced current (EBIC) method [1], which is a detection method used in scanning electron microscopy (SEM). Using this method we are able to locate internal electric fields and recombination centers in semiconductor samples or semiconductor devices. Furthermore, EBIC can be used to measure the diffusion length of minority charge carriers and the local doping type in semiconducting samples. Other measurement methods we use for the investigation of defects, such as transmission electron microscopy (TEM), spreading resistance profiling (SRP), capacitance-voltage (CV) and four-point resistivity measurements. Our main concern lies on the investigation of defect complexes in silicon formed by proton irradiation followed by heat treatment [3]. However, measurements of defects in GaN will also be shown. [1] T. E. Everhart, and P. H. Hoff, J. Appl. Phys. 42, 5837 (1971) [2] S. Kirnstötter et al., ECS Transactions, Vol. 50, 115 (2013) [3] M. Faccinelli et al., Phys. Status Solidi C, (to be published)

15:45

CM T37

Investigation of performance limiting point defects at semiconductor-oxide interfaces using electrically detected magnetic resonance Gernot Gruber, Markus Koch and Peter Hadley TU Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz Defects at semiconductor-oxide interfaces in the channel of a transistor can act as trapping or scattering centers thereby limiting the carrier lifetime, degrading the carrier mobility, shifting the threshold voltage and causing parasitic device leakage currents. For certain high power applications, wide band gap materials such as Silicon Carbide (SiC) and Gallium Nitride (GaN) are of particular interest due to their superior intrinsic material properties (i.e. high breakdown voltage, high thermal conductivity, better switching performance…). Devices based on wide band gap semiconductor materials exhibit considerably higher defect densities than devices based on silicon technologies. The key for developing competitive and reliable wide band gap devices is to minimize the number of atomic scale defects by optimizing the processing parameters. Electrically Detected Magnetic Resonance (EDMR) can be used to identify the microscopic structure of defects. EDMR is an experimental technique where the change of a current in a fully processed semiconductor device is used as a means to obtain the electron spin resonance (ESR) spectrum of electrically active defects in the device. ESR is the measurement of transitions between the Zeeman levels of the unpaired electrons in a magnetic field. The transitions are induced by a microwave field. Resonance is obtained when the microwave photons match the energy difference between the Zeeman levels which can be adjusted by sweeping the magnetic field.

16:00 16:29

Kaffeepause / Coffee break

12

Zeit time

ID

16:30

CM T41

COND, Session 4 Chair: Oskar Paris High Precision Experiments with Cold and Ultra-Cold Neutrons Hartmut Abele TU Wien, Stadionallee 2, 1020 Wien The talk addresses some questions of particle and nuclear physics and concerns the search for possible deviations from the Standard Model (SM) of particle physics with cold and ultracold neutrons. The deviations are expected to be the phenomenological outcome of more fundamental theories, unifying all forces induced shortly after the Big Bang. Precise symmetry tests of various kinds are coming within reach with proposed neutron facilities, where count rates of neutron decay products are increased by a factor 100 compared to best experiments. The goal is neutron beta-decay spectroscopy, where the spectra and angular distributions of the emerging decay particles will be distortion-free on the level of 10-4. Next, we present a novel direct search strategy with neutrons based on a quantum bouncing ball in the gravity potential of the earth. The aim is a test of Newton’s gravity law with a quantum interference technique, providing a constraint on any possible new interactions on the level of accuracy.

17:00

CM T42

Methodische Entwicklungen in der Neutronenultrakleinwinkelstreuung Erwin Jericha, Wilfried Mach, Tobias Rechberger, Alexander Zdarzil and Gerald Badurek TU Wien, Atominstitut, Stadionallee 2, 1020 Wien Neutronenultrakleinwinkelstreuung ermöglicht die Untersuchung an Mikrostrukturen kondensierter Materie ihm Bereich von einigen Zehntel bis etwa 20 – 30 Mikrometer Größe der Streuer. Damit liegt sie zwischen dem Bereich der traditionellen Neutronenkleinwinkelstreuung und den direkten bildgebenden Verfahren der Neutronenforschung. Die Methode zeichnet sich durch eine hochaufgelöste Komponente des Streuvektors mit einer Auflösung von Mikroradiant aus, während sie über die dazu orthogonale Komponente integriert. Zusätzlich ergibt sich das experimentelle Streubild aus einer Verschmierung der idealen Streukurve der untersuchten Strukturen mit der Auflösungfunktion einer Perfektkristallanordnung [1]. Modellunabhängige Verfahren erlauben es, diese beiden Effekte rechnerisch zu invertieren und eine Annäherung an die ideale Streukurve zu erreichen. Von diesem Punkt aus sind dann Standardmethoden für die Analyse der Kleinwinkelstreuung einsetzbar. Computergestützte Datensynthese lässt den Einfluss der Instrumentierung auf die experimentellen Ergebnisse nachvollziehen. Dabei zeigt sich auch, wie verschmierende Effekte, die durch Polydispersivität oder Streuwahrscheinlichkeit zustande kommen, sich überlagern. Simulationen mit verschiedenen Objektgrößen haben verdeutlicht, dass das Unterscheidungsvermögen von Objekten im oberen Auflösungsbereich der Methode stark von der Streuwahrscheinlichkeit beeinflusst wird. Wir verdeutlichen diese Zusammenhänge mit einigen illustrativen Beispielen. [1] E. Jericha, G. Badurek, C. Gösselsberger, Physics Procedia 42 (2013) 58.

17:15

CM T43

Detailed shape retrieval of colloidal inorganic nanocrystals from SAXS-data Max Burian, Gerhard Fritz-Popovski (2), Oskar Paris (2) and Rainer T. Lechner (2) TU Graz, Institute of Inorganic Chemistry, Stremayrgasse 9/V, 8010 Graz (2) Montanuniversität Leoben, Institut für Physik, 8700 Leoben Recent work has shown that the unique physical properties of inorganic nanocrystals (NCs) can be related and influenced by their size and shape. [1] With the gaining controllability of the NC-synthesis procedures and therefore the NC shape the level of structural detail is increased. This implies the requirement of advancements regarding the three-dimensional resolution of measurement techniques. We present DAMMIN [2], a software package developed for the shape-retrieval of strictly monodisperse proteins, as a powerful tool for application on colloidal NC systems. Theoretical SAXS patterns of given simple geometries were calculated and used as an input for the program. To directly compare the retrieved models to the initial dimensions, evaluation algorithms were developed and applied. Using these methods, we studied the stability of the obtained models for increasing size distributions as well as for varying fitting parameters. [1] K.L.Kelly, et al., J.Phys.Chem.B, 2003. 107(3): 668-677 [2] D.I. Svergun, Biophys.J., 1999. 76(6): 2879-2886

13

17:30

CM T44

Metastable crystal phase in the shell of PbS/CdS core/shell nanocrystals Rainer T. Lechner, Gerhard Fritz-Popovski, Maksym Yarema, Wolfgang Heiss and Oskar Paris MU Leoben, Institute of Physics, Franz-Josef-Strasse 18, 8700 Leoben The chemical synthesis of core/shell colloidal nanocrystals (NCs) have led to a pronounced improvement in the optical properties and the chemical stability of semiconducting NCs [1]. The main topic of this work is the structural characterisation of core/shell NCs with small angle x-ray scattering and diffraction techniques (anomalous SAXS, SAXS and XRD) at laboratory- and synchrotron sources (HZB-BESSY and ESRF) as well as to complete these findings with complementary microscopy techniques. The detailed knowledge of the structural properties of the core/shell NCs allows to study the impact of the nanometer sized dimensions on their magnetic and optical properties. The infrared emission of lead chalcogenide nanocrystals (NCs) can be drastically increased stabilising the core with a hard protective shell [1, 2]. In contrast to a shell growth on top of a core [5], we investigated in this study the CdS-shell growth on PbS NCs driven by Cd for Pb cation exchange [3]. Especially, we studied three different final shell thicknesses of 0.9, 1.5 and 2 nm using three different diameters for the initial PbS NCs of 4.7 nm (small), 6.3 nm (medium) and 8.7 nm (large). The chemical composition profile of the CdS-shell as a function of reaction time is derived from anomalous SAXS (ASAXS) experiments in sub-nanometer resolution. The crystal structure of the shell was derived by XRD combined with TEM measurements, respectively. We relate the chemical and structural information to the measured PL intensities of the core/shell NCs. We reveal the existence of two different crystalline phases, i.e. the metastable rock salt and the equilibrium zinc blende phase within the chemically pure CdS-shell. The highest improvement in the PL emission was achieved for 0.9 nm shells depicting a large metastable rock salt phase fraction matching the crystal structure of the PbS core [3]. [1] P. Reiss, et al., Small, 2009, 5, 154–68 [2] M. Yarema, et al., ACS Nano 2011, 5, 3758–3765 [3] R.T. Lechner, et al., submitted 2014

17:45

CM T45

In-situ SAXS/WAXS as a novel method to study ion transport phenomena in confined geometry Christian Prehal, Daniel Weingarth, Emilie Perre, Rainer T. Lechner, Heinz Amenitsch (2), Oskar Paris and Volker Presser Montanuniversität Leoben, Institute of Physics, Franz-Josef-Straße 18, 8700 Leoben (2) TU Graz, Institut für Anorganische Chemie, Stremayrgasse 9, 8010 Graz Supercapacitors or Electrical Double-layer capacitors (EDLCs) are devices used for efficient energy storage with high power density. In contrast to batteries the energy is stored electrostatically utilizing the capacitive behavior of the opposed charges of electrons and ions at the electrode-electrolyte interface. We studied by in-situ SAXS/WAXS the arrangement and transport of ions within the micro- and mesopores (nm-scale) of activated carbon based EDLCs as a function of the applied voltage signal. The measurements were performed at the Austrian SAXS beamline at the Synchrotron radiation source ELETTRA, providing a time resolution of about 1 second. The change in the SAXS signal during in-situ voltage cycling is evaluated by calculating integral parameters such as integrated intensity and correlation length for specific regimes of the modulus of the scattering vector, Q. The correlation length – corresponding to the ratio of the first to the second moment of the scattering curve in a defined Q-regime – is sensitive to structural changes within the porous carbon sample. Hence, we were able to study the mechanical response of the hierarchical pore network on ion electrosorption in highly disordered activated carbons and its relation to the ion transport.

14

18:00

Raman investigation of Tannin based rigid foams

CM T46

Andreas Reyer, Gianluca Tondi, Alexander Petutschnigg, Martin Demker and Maurizio Musso Universität Salzburg, Hellbrunnerstraße 34, 5020 Salzburg Tannin-based rigid foams are innovative materials made of inexpensive organic ingredients, and are produced via an acid catalyzed polycondensation reaction between furfuryl alcohol and condensed flavonoids (e.g. Mimosa tannin). The most important physical properties of these bio-friendly foams are their low thermal conductivity and their high fire resistance. Due to these advantageous properties, such innovative materials have already been proposed as insulating material for eco-sustainable buildings (green building technology). The target of the present study is the characterization of the tannin-based rigid foams by Raman spectroscopy in order to compare their spectral signature with that of the precursor materials furfuryl alcohol, polymerized furfuryl alcohol, and tannin. At present the most interesting information obtained deals with the still preserved organic nature of the tanninfuranic foam compared to a carbon material.

18:15

Inelastic HAS intensities on Sb(111): Indication of a lowlying acoustic plasmon mode

CM T47

Patrick Kraus, Florian Apolloner, Christian Gösweiner, Giorgio Benedek and Wolfgang E. Ernst Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz As one of the essential components in the recently discovered group of topological insulators [1], the semimetal antimony (Sb) is an attractive candidate for studying the properties of its surface. Quite recently the surface phonon dispersion curve of Sb(111) as well as the influences of electron-phonon interactions were calculated using density functional perturbation theory [2]. However, there has been a shortage of experimental data for comparison and verification of the models used. Hence, for a comprehensive understanding of topological insulators, measurements on antimony are long overdue. As a surface sensitive technique, Helium Atom Scattering (HAS) allows to investigate elastic as well as inelastic phenomena associated with structure and dynamics of the electronic corrugation slightly above the Sb(111) surface [3, 4, 5]. Recent HAS measurements on Sb(111) aimed at measuring the surface phonon dispersion hinted on a previously unidentified branch below the expected position of the rayleigh mode. This branch could be assigned to a two-dimensional surface localized acoustic plasmon mode [6] with a maximum energy at the K-point below 3 meV. This peculiar mode originates in the special electronic structure with two spin-split minibands present in Sb(111). HAS experimental data including the surface phonon dispersion will be presented. [1] [2] [3] [4] [5] [6]

18:30

H. Zhang et al., Nature Physics 5 (2009) 438-442 D. Campi et al., Phys. Rev. B. 86 (2012) 075446 M. Mayrhofer-R., J. Phys. Condens. Matter 25 (2013) 395002 M. Mayrhofer-R., Phys. Rev. B 88 (2013) 205425 P. Kraus, Phys. Rev. B 87 (2013) 245433 Private communication, Arturo Tagliacozzo

Ende der Veranstaltung / End of session

15

COND Donnerstag/Thursday, 24.09.2014, 15-17, Festsaal Sparkasse

Zeit time

ID

15:00

CM T51

COND, Session 5 Chair: Walter Poetz Hidden Scale Invariance in Metallic Elements Felix Hummel, Georg Kresse, Jeppe Dyre and Ulf Pedersen University of Vienna, Sensengasse 8/12, 1090 Vienna Simple liquids or strongly correlated liquids (SCL) exhibit identical thermodynamical behaviour up to unit scaling for states on isomorph curves. Melting lines and lines of constant excess entropy follow isomorph curves for simple liquids. We performed ab-initio calculations for all metal melts at the triple point, testing the degree of isomorphic behaviour. We find that most melts are indeed simple to a high degree, at least at PBE-DFT level. We also show that an inverse-power-law (IPL) model – forming fully correlated liquids – gives an excellent approximation for thermodynamic properties of the simple metal melts. For those metals, the IPL approximation even allows to predict the ambient pressure crystal structure solely from ab-initio liquid data.

15:15

Density determination of liquid metals

CM T52

Alexander Schmon, Kirmanj Aziz and Gernot Pottlacher TU Graz, Petersgasse 16, 8010 Graz Density determinations by means of fast resistive pulse-heating or electromagnetic levitation at TU Graz are based on thermal expansion measurements by optical imaging methods. During pulse-heating, wire shaped specimens as part of an electrical discharge circuit are heated up to the end of the liquid phase within 60 µs. During this short period the samples maintain their geometry and gravitational influences can be neglected. The thermal expansion is determined by shadowgraph-imaging with a CCD-camera system. Recently an electromagnetic levitation system was built up, allowing noncontact investigations of samples by levitating them. The samples are levitated and heated by an inhomogeneous radio-frequency electromagnetic field inducing eddy currents within the sample material. For volume expansion determination shadowgraph-images are recorded by a high speed CCD camera. The density is calculated using edge detection algorithms. Parts of this research were funded by the Austrian Science Fund (FWF): FWF Project P 23838-N20

15:30

CM T53

In-situ electrodeposition of Co in a SQUID magnetometer to study the absolute magnetic moment of ultrathin Co layers Stefan Toplovec, Heinz Krenn (2) and Roland Würschum Graz University of Technology, Institute of Materials Physics, Petersgasse 16, 8010 Graz (2) Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz Thin magnetic films formed by electrodeposition have attracted considerable attention in the last years [1]. To study the evolution of the magnetic moment m while electrodepositing thin Co layers, we have designed a three-electrode electrochemical cell for operation in a commercial state-of-the-art SQUID magnetometer, which allows the simultaneous measurement of magnetization and cyclic voltammograms [2, 3]. Using this new in-situ technique, a precise cancellation of the background signal of the cell and substrate was possible. Thus the absolute magnetic moment m exclusively of the Co layer could be determined. By growing and subsequent dissolving Co layers with different thicknesses we could show, that in the regime of a few monolayers, Co has an enhanced magnetic moment compared to the bulk. This increased magnetic moment may arise from an uncompensated orbital moment [4]. [1] [2] [3] [4]

P. Allongue et al., Surf. Sci. 603 (2009) 1831 S. Topolovec et al., J. Magn. Magn. Mater. 329 (2013) 43. E.-M. Steyskal et al., Beilstein J. Nanotechnol. 4 (2013) 394. M. Tischer et al., Phys. Rev. Lett. 75 (1995) 1602.

16

15:45

CM T55

Plasmon dispersion and lifetime in the two-dimensional electron liquid Jürgen Thomas Drachta, Dominik Kreil, Raphael Hobbiger and Helga M. Böhm JKU Linz, Altenbergerstraße 69, 4040 Linz The two-dimensional electron liquid is present in several physical systems: From semiconductor heterostructures to liquid helium surfaces. One characteristic excitation in such systems is the plasmon, which relies on the coulomb interaction between the particles. In the low density regime, where the correlations between the particles become to be more prominent, the random-phase-approximation (RPA) does not explain the properties of the plasmon excitation properly. The dynamic pair theory based on the work of E. Krotscheck's group allows to calculate a realistic dispersion and also gives a finite plasmon lifetime in contrast to the RPA.

16:00

CM T56

Correlated photons from microcavity polaritons Patrick Mai, Mathias Sassermann, Zoltán Vörös, Gregor Weihs and Wolfgang Langbein University of Innsbruck, Department for Experimental Physics, Technikerstrasse 25/d, 6020 Innsbruck Several theoretical works suggest that the scattering of microcavity polaritons (the coherent superpositions of a cavity photon and a quantum well exciton, where the interaction is induced by the excitonic component) can be a source of non-classical photon correlations, producing photon pairs that are entangled in either the energy, or the polarization degree of freedom. One appeal of such a system is that the polariton-polariton interaction strength is a tunable parameter. However, due to the lack of high-quality samples, experimental realisations of these schemes are still missing. In this contribution, we will discuss our work on polariton-polariton scattering. We make use of a sample with ultralow photonic and excitonic disorder, and this allows the creation and detection of correlated light. We demonstrate in detail, how correlations depend on a number of experimental parameters, such as the detuning (polariton-polariton interaction strength), polarisation, excitation density.

16:15

CM T57

Chromium on superfluid Helium nanodroplets: Theoretical investigation of the ground state and selected excited states Martin Ratschek, Johann V. Pototschnig, Andreas W. Hauser and Wolfgang E. Ernst Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz Single chromium atoms immersed in superfluid helium nanodroplets are investigated by helium density functional theory [1] (DFT) based on diatomic Cr-He potentials. These Cr-He potentials were determined for the ground state and selected excited states in septet and quintet multiplicity [2]. The potentials were calculated with multiconfigurational selfconsistent field (MCSCF) orbitals that were applied in a multireference configuration interaction (MRCI) calculation. Based on the potentials, the localization of Cr on He droplets can be determined by minimizing the energy for different distances between the center of mass of the He droplet and the Cr atom using DFT calculations. Furthermore, DFT calculations were conducted to investigate the line shift and line broadening of electronic excitations of Cr atoms immersed in He droplets. The line shift is acquired by optimizing the density of the initial state and evaluating the energy based on the potential of the target state. The line broadening is dominated by oscillations of the He density around immersed dopants. The results will be discussed in the light of recent experiments [3]. [1] M. Ratschek, J. V. Pototschnig, A. W. Hauser, and W. E. Ernst, J. Phys. Chem. A, accepted, DOI: 10.1021/jp5034036 [2] J. V. Pototschnig, M. Ratschek, A. W. Hauser, and W. E. Ernst, Phys. Chem. Chem. Phys., 2014, 16, 9469-9478 [3] A. Kautsch, M. Koch, and W. E. Ernst, J. Phys. Chem. A, 2013, 117, 9621-9625

17

16:30

CM T58

Novel exact closed-form solutions for the resonant frequencies and mode-shapes of Euler-Bernoulli beams with constant thickness and polynomial width Roman Beigelbeck, Michael Schneider, Michael Stifter, Thomas VoglhuberBrunnmaier, Bernhard Jakoby, Ulrich Schmid and Franz Keplinger Danube University Krems, Viktor Kaplan Street 2, 2700 Wiener Neustadt Many physical and technical applications rely on resonant flexural vibrations of non-uniform Euler-Bernoulli (EB) beams. Prominent examples are top-notch micro- and nano-cantilevers applied for atomic force microscopy, magnetic field sensing, or shear viscosity sensing. Accurate design of such devices requires detailed knowledge of the beams’ resonance characteristics, where the governing theory was enunciated more than a quarter-century ago. Since then, many approximate and computational models for a variety of beam shapes as well as some exact solutions for a few particular geometries have been reported. Wherever feasible, analytical solutions are preferred as it is difficult to draw general conclusions using only numerical methods. However, no all-embracing exact closed-form solutions for EB beams are known hitherto. In this contribution, we study the vibration characteristics of a very general class of EB beams with in x-direction varying stiffness EI(x) and mass per unit length mL(x) but constant EI(x)/mL(x)-ratio analytically and present novel exact solutions in order to bridge the gap between known results. We apply the EB theory to beams with a constant thickness h and a polynomially varying width b(x). Next, the arising fourth order differential equation with non-constant coefficients is factorized by a sophisticated non-linear transformation into a Meijer G differential equation. Afterwards, its general solution can be written in terms of four linearly independent Meijer G functions which can be efficiently computed. At this point, this closedform solution is independent of the clamping conditions and is therefore valid for arbitrary beam types like cantilevers or bridges. Finally, straightforward fitting of four boundary conditions yields characteristic equations for natural frequencies fr and mode shapes up to any order. Our solution allows analytically studying of a comprehensive class of flexural beam vibration problems which has not been possible hitherto and has thus high potential in modern vibration tailoring. We validate our method by finite element simulations and measurements carried out on cantilevers and bridges with varying widths b(x) (e.g. trapezoid and quadratic), where the specimens are fabricated by silicon micromachining. During the experiments, the beams are placed in a vacuum chamber, excited to vibrations by Lorentz forces and measured by Laser Doppler vibrometry to obtain their transverse deflection w(x).

16:45

Ende der Veranstaltung / End of session

18

COND Donnerstag/Thursday, 24.09.2014, 15-16:45, Festsaal Rathaus

Zeit time

ID

15:00

CM T61

COND, Session 6 Chair: Rainer Lechner A simple model to study the influence of topology and distribution of reversible sacrificial bonds on the mechanical behavior of polymers S. Soran Nabavi and Markus A. Hartmann Montanuniversitaet Leoben, Institute of Physics, Franz-Josef-Strasse 18, 8700 Leoben One possibility to dramatically enhance the toughness of polymeric networks is to use reversible crosslinks. The same strategy is used in nature where these so called sacrificial bonds (SBs) can be found in such diverse materials as bone, wood, silk and mussel byssus threads. Sacrificial bonds (SBs) are reversible bonds which are weaker than the covalent bonds that hold the structure together. Thus, upon loading SBs break before the covalent bonds rupture. The rupture of SBs reveals hidden length providing a very efficient energy dissipation mechanism. Furthermore, SBs can reform after their rupture providing molecular repair and self-healing. Using Monte Carlo simulations we examine a simple model system and study the influence of the topology and SB density on the mechanical properties of single polymeric chains. The main mechanical properties of the system are assessed performing computational tensile and cyclic loading tests. It is shown, first, that compared to the theoretical value the strength of single SBs is strongly reduced due to thermal fluctuations of the backbone [1]. Second, the topology of SBs largely influences the work to fracture as well as the dissipated energy. Third, the distribution of SBs along the polymer chain is a key factor in tailoring for specific mechanical properties like work to fracture, strength and apparent stiffness. These results bear important implications for the understanding of natural systems and for the generation of strong and ductile biomimetic polymers. [1] S. S. Nabavi, M. J. Harrington, O. Paris, P. Fratzl, M. A. Hartmann, New J. Phys. 16, 013003 (2014)

19

15:15

CM T62

A tubular resonator operated in wall-thickness-mode for simultaneous longitudinal viscosity and speed of sound sensing of liquids Thomas Voglhuber-Brunnmaier, Roman Beigelbeck, Hannes Antlinger, Stefan Clara, Samir Cerimovic, Bernhard Jakoby and Franz Keplinger Danube University Krems, Viktor Kaplan Strasse 2, 2700 Wiener Neustadt Modern online process controls show an increasing demand for low cost and robust sensors to monitor physical liquid parameters. Recently, we have evaluated the viscous attenuation of pressure waves as a promising characteristic for such liquid monitoring tools. The crucial parameter in this context is the longitudinal viscosity, a combination of the shear and dilatational viscosity coefficients. In contrast to many ultrasonic shear viscometers (e.g. ATcut quartz resonators), this method benefits from the large penetration depth of pressure waves in liquids which facilitates probing the bulk of the liquid rather than a thin surface layer. However, by nature, this sensing principle requires accurate acquisition of low damping values as well as suppression (or computational correction) of spurious energy losses (e.g. diffraction effects, spurious modes) to ensure reliable results. The latter is a profound task which limits the applicability of the previously introduced parallel plate resonator to high-viscosity liquids. In this contribution, we present a tubular liquid resonator that overcomes this drawback and extends the attainable viscosity range to multiple orders in magnitude. The devised sensor device relies on a custom designed PZT tube filled with the sample liquid, which operates in wall-thickness-mode exciting microacoustic radial modes in the liquid. The electrical characteristic measured at the PZT electrodes reflects through the inverse piezoelectric effect the liquid loading and thus the physical properties of the liquid. Consequently, this method enables simultaneous determination of the longitudinal viscosity and the speed of sound in the liquid from the attenuation and spacing of the resonance peaks, respectively, by fitting a rigorous analytical model. The validity of this model is verified by 3D finite element simulations of the liquid resonator setup. We demonstrate the performance of two different PZT prototypes by measuring the longitudinal viscosity of deionised water, S200 viscosity standard, and various aqueous glycerol solutions in a climatic chamber between 20 – 40°C. The measurement range of the longitudinal viscosity comprises remarkable 1 – 4000 mPas with good agreement of measured and reference data.

15:30

CM T63

Analysis of the propagation of electromagnetic waves in inhomogeneous solids for applications in mining Ronald Meisels, Michael Toifl, Philipp Hartlieb, Friedemar Kuchar and Thomas Antretter Montanuniversität Leoben, Institute of Physics, Franz Josef Strasse 18, 8700 Leoben In this work electromagnetic simulations of the propagation of beams in an inhomogeneous medium are presented. These calculations are motivated by the reduction of the energy needed to fracture rocks when they are weakened by internal cracks caused by internal stresses created by microwave induced inhomogeneous heating. The rocks are modeled as a two phase composite with different complex permittivities – absorptive inclusions inside a matrix. The propagation is simulated using the finite difference time domain (FDTD) algorithm. To analyze the effect of disorder the field patterns are compared with the propagation in an equivalent homogeneous effective medium. The resulting heat input generated by the electric field distribution is then used for subsequent thermo mechanical calculations of the internal stress fields. This work is supported by the Austrian Science Fund (FWF) project TRP 284-N30

20

15:45

CM T64

Characterisation of microfiltration membranes by wetting investigations in the ESEM Manfred Nachtnebel and Peter Pölt Institute for Electron Microscopy and Nanoanalysis (FELMI-ZFE), Steyrergasse 17, 8010 Graz Polymeric microfiltration membranes are used in a great variety of applications such as waste water treatment or filtration of colloids and particles in the beverage industry. The increase in the complexity of the structure of these membranes requires also more and more sophisticated characterization methods which allow especially a deeper insight into the interaction between the pore walls and the applied fluid at the different membrane layers. Therefore a new investigation method was developed and a special experimental setup was designed and manufactured. This setup enables wetting and drying of the membrane within the specimen chamber of an environmental scanning electron microscope (ESEM). The possibility to also take images of wet specimens at high resolution makes the ESEM a perfect tool for the study of physical/chemical processes on the microscale. Additionally the setup enables the simultaneous recording of the temperatures at the two membrane surfaces. These two temperature characteristics provide information about both the interior membrane structure and the interaction between the water and the pore walls. Because of the variation of the layer setup (thickness and position) of microfiltration membranes each membrane type has its own kind of temperature profile. Correlation of the results gained at the micro-and macroscale gives detailed information of the membrane behaviour in real conditions. An improvement of the structure determination can be achieved by either sealing one surface or modifying the parameters controlling the wetting and drying process. A change in the temperature profile also shows up if the surface properties of the membrane were modified. The method enables also the possibility to investigate used membranes and thus to get additional information about the ageing process.

16:00

CM T65

Experimental and computational aspects of analytical electron tomography and its application to nanomaterials Angelina Orthacker, Georg Haberfehlner, Johannes Tändl, Cecilia Poletti and Gerald Kothleitner FELMI-ZFE, Steyrergasse 17, 8010 Graz The importance of light materials with a high mechanical stability is constantly increasing, as these materials for instance enable energy efficient and safe transport, like in aviation. The material studied in this work is an alloy containing scandium and zirconium rich nanoparticles, which increase the material’s mechanical resistance, when embedded in the aluminium-magnesium matrix. Transmission electron microscopy (TEM) and analytical scanning transmission electron microscopy (STEM) were used to investigate the material at the nanoscale. First investigations revealed that the sizes and exact chemical compositions of the nanoparticles can vary, depending on the aging process. It was confirmed that the crystal structure of the nanoparticles, with the basic composition Al3Sc, coherently matches the crystal structure of the matrix. Furthermore, upon longer aging, these particles can even exhibit a weak core-shell structure. This is because more Zr atoms occupy Sc lattice sites in the shell due to the slower diffusion of Zr – compared to Sc – in the matrix. The integrative character of the signal acquired through transmission might hide important structural details of the material, relevant for its properties. Those details can be revealed by using electron tomography, where the data is acquired at different tilt angles and, after alignment, reconstructed to form a full 3D model of the investigated material. The combination of both techniques, analytical STEM and tomography, offers a more complete understanding of the material’s structure and composition. Material aspects as well as tomography and STEM related procedures and developments shall be presented.

21

16:15

CM T66

Analysis of amorphous-nanocrystalline silicon thin films by time-of-flight elastic recoil detection analysis and highresolution electron microscopy Krunoslav Juraić, Davor Gracin (2), Zdravko Siketić (2) and Miran Čeh(2) TU Graz, Stremayrgasse 9/IV, 8010 Graz (2) Ruñer Bošković Institute, Croatia The in-depth distribution of hydrogen atoms in 100 nm thick amorphous-nanocrystalline silicon films (a-nc-Si:H) was estimated by Time-of-Flight Elastic Recoil Detection Analysis (TOF-ERDA) using previously described setup. The layer with nanocrystals were deposited on 50 nm amorphous layer by plasma enhanced chemical vapour deposition, using silane gas highly diluted with hydrogen. As seen by high resolution transmission electron microscopy (HRTEM), the films contained nanocrystals of silicon embedded in amorphous Si: H matrix. The size of crystals and crystal to amorphous fraction increased starting from substrate towards surface of the film. Amorphous matrix looked uniform except in the area close to a-Si:H/a-nc-Si:H interface where spots brighter than average appeared. These areas can be attributed to less density material, presumably voids. It is assumed that the surface of voids is “decorated” with hydrogen that saturates silicon “dangling bonds”. That is why distribution of hydrogen should indicate density fluctuation in material. Consistent with this assumption, TOF- ERDA showed non uniform distribution of hydrogen across the depth with maximum close to a-Si:H/a- nc-Si:H interface that coincidence with less density material seen by HRTEM. This supports the idea about important influence of voids in crystal formation, in particularly in nucleation phase. After heat treatment at 400 °C, the distribution of hydrogen remained the same, while total hydrogen concentration decreased. This indicated that the type of hydrogen bonding was the same across the amorphous network and assumed that areas of less density materials consist of agglomerates of smaller voids.

16:30

CM T68

Initial film growth studies of indigo on SiO2 Boris Scherwitzl, Adolf Winkler and Roland Resel Graz University of Technology, Institute of Solid State Physics, Petersgasse 16, 8010 Graz Natural dyes have been used for thousands of years to color textiles and food but have only been discovered recently as promising semiconducting materials, attributable to the formation of hydrogen bonds and charge carrier movements perpendicular to the growth direction. In this work adsorption and desorption behavior, as well as the initial film growth was studied in detail for indigo molecules on silicon dioxide. The material was evaporated onto the substrate by means of physical vapor deposition under UHV conditions and thin films were subsequently studied by Thermal Desorption Spectroscopy, Auger Electron Spectroscopy, X-Ray Diffraction and Atomic Force Microscopy. A comparison between sputter cleaned and carbon contaminated surfaces led to differences in diffusion behavior and island growth. In the first case the substrate is reactive and indigo molecules are very strongly bonded to the substrate. They do not desorb for coverages of up to 1.6 Å mean film thickness. Subsequently a weakly bonded α-state forms, which consists, in our current understanding, of highly mobile dimers. One indigo molecule lies on top of another molecule and thus de-stabilizes any hydrogen bonds to the substrate. At higher coverages those dimers get incorporated into more stable 3D-islands. On carbon covered surfaces the α-state corresponds to weakly-bonded monomers that diffuse across the surface in a metastable state. Once a certain coverage that is well below the coverage needed to form a complete monolayer is reached, the molecules form island structures (β-state) that desorb at higher temperatures. Surface morphology investigations on ultra-thin films (0.4 nm), performed ex-situ, show small, almost round islands of about 10 nm height. Thicker films (40 nm) exhibit big differences in the island formation between sputter-cleaned and carbon contaminated surfaces. Dimers on sputter cleaned surfaces seem to have better diffusion compared to monomers on carbon. The sticking coefficient was found to be unity in all cases.

16:45

Ende der Veranstaltung / End of session

22

COND Poster Donnerstag/Thursday, 24.09.2014, 18-19:30, Schloss Pöllau

ID

CM P01

COND, Poster Chair: NN Tuning mesoporous silica films properties by Deep X-ray Lithography for fluidics applications Benedetta Marmiroli, Barbara Sartori and Heinz Amenitsch Instiute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz In this communication, we will present deep X-ray lithography (DXRL) as an effective top down technique to tune the properties of mesoporous silica films (pores in the order of 2-10 nm) that can be used as “bricks” to build new generation lab on chips. The objective is to improve the performance of microfluidic systems in handling biological and chemical samples through the employment of materials with selected functionalities in tailored regions of the device. DXRL allows a controlled irradiation of samples with high energy X-rays (3 – 20 keV) that provoke chemical and structural changes in the material. DXRL can be used to obtain microstructures with free shape, high aspect ratio, almost vertical sidewalls and a lateral resolution down to 200 nm. Using DXRL as patterning technique, mesoporous silica films can be used for example as DNA arrays, or can be functionalized with enzymes to achieve selective bioactive areas. Usually, mesoporous silica presents a hexagonal arrangement of the pores parallel to the substrate, making it a good choice for microfluidics. With irradiation, such structure can undergo damage, leading to a wormlike arrangement of pores that are not connected. There is therefore the need to optimize the irradiation dose in order to get the best quality pattern while maintaining the functionality of the material. We will describe the effect of irradiation on the films composition. We will also present the results about the structural investigation of the films through Grazing Incidence Small Angle X-Ray Scattering with different preparation conditions and different irradiation doses, showing that high quality patterns can be obtained while still retaining the hexagonal structure.

CM P02

Measurement of selective adsorption resonance lifetimes from drift spectra of ⁴He-Sb(111) Florian Apolloner, Patrick Kraus, Christian Gösweiner, Michael Mayrhofer-Reinhartshuber, Salvador Miret-Artés and Wolfgang E. Ernst Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz Antimony (Sb) has recently attracted great interest due to its unexpected surface properties. Its semimetal surface turns out to be one of the buildings blocks for topological insulators. Furthermore, Sb(111) nanofilms are used as testbed for investigation of topoelectronic phase transitions. Helium atom scattering (HAS) provides an ideal tool for non-destructive and completely surface sensitive high resolution surface analysis. By exploiting the high resolution of HAS it is possible, among other things, to measure surface phonon dispersions, where the optical branch for Sb(111) is at about 20 meV. For an exact analysis of experimental HAS data a lot of effects and their ramifications on the measurements have to be considered. Among those effects are selective adsorption resonances (SAR) which, on one hand allow the calculation of a gas-surface interaction potential and on the other hand provide a way to enhance other features in the experimental data. When a helium atom enters an SAR it interacts with a bound state of the gassurface potential while moving parallel to the surface. Longer lifetimes in this bound state can then lead to higher interaction probabilities with the surface electron cloud, resulting in an amplification of otherwise unobservable effects. Due to moving threshold multichannel scattering the formation of these SAR is highly dependent on experimental parameters (initial energy and angle). As a result the inherent width of these resonances is not accessible directly from the experimental data, but can be obtained by using the kinetic energy of the resonant channel as dynamic variable. Additionally a so called critical kinematic effect (CKE) can be observed, which leads to a strong broadening of the resonances, requiring further treatment to relate to inherent widths. Lifetimes are then extracted from those inherent widths and compared to theoretical calculations using the Fermi golden-rule.

23

CM P03

Effect of humidity and salts on the mesostructure of silica nanoparticles synthesized in the gas phase Barbara Sartori, Benedetta Marmiroli, Fernando Cacho-Nerin and Heinz Amenitsch TU Graz, Institute of Inorganic Chemistry, Stremayrgasse 9/IV, 8010 Graz The synthesis of mesostructured silica nanoparticles can be achieved by various adjustments of synthesis conditions. Good control of the morphology, particle size, and uniformity is getting more and more important for applications in catalysis, adsorption, optical devices, bio-imaging, drug delivery, and nanomedicine. We previously characterized with SWAXS the effect of temperature on the mesostructure formation of silica nanoparticles synthesized in the aerosol-based route (ÖPG Tagung 2013). The templating agent, cetyltrimethylammonium bromide (CTAB), drives the condensation of tetraethyl ortosilicate (TEOS) molecules into an organized structure: the silica self-assembly process can be studied in-situ as the nebulized percursor solution flows along the steep temperature gradient obtainable in our custom built reaction chamber. In the present communication we will show how the relative humidity of the carrier gas, and the presence of NaCl,(NH4)2SO4 and CeCl3 in the precursor solution, influence the silica mesostructure.

CM P04

Sorption-induced deformation of hierarchical silica-based monoliths Roland Johann Morak, Christian Balzer, Maxim Erko, Christos Triantafillidis, Nicola Hüsing, Gudrun Reichenauer and Oskar Paris Montanuniversität Leoben, Institute of Physics, Franz-Josef Straße 18, 8700 Leoben The deformation of nanoporous materials upon adsorption and condensation of fluids is of considerable interest in science and technology. Silica-based monolithic samples with hierarchical porosity were investigated, consisting of a macroporous network of struts, each strut containing well-defined cylindrical mesopores ordered on a 2D hexagonal lattice. The deformation of the pore lattice was measured using insitu small-angle X-ray scattering (SAXS), by evaluating the shift of the Bragg-reflections during adsorption and desorption of n-pentane used as a model fluid [1, 2]. The macroscopic expansion/ contraction of the sample was determined with the same model fluid using in-situ dilatometry [3]. The experimental results of both methods show similar strain isotherms, which are in general agreement with recent theoretical predictions. Surprisingly the total strain obtained from dilatometry is higher than the one measured with SAXS. This difference is attributed to the different sensitivity of the two methods to anisotropic deformation of the hierarchical solid framework. With SAXS, only the radial strain of the mesopore lattice in each strut is considered, thus being sensitive to the radial deformation of the struts. In contrast dilatometry is sensitive to the isotropic volumetric strain of the whole macroporous network. [1] Guenther, G., J. Prass, O. Paris, and M. Schoen, Novel insights into nanopore deformation caused by capillary condensation. Physical Review Letters, 2008. 101(8): p. 086104; [2] Prass, J., D. Mueter, P. Fratzl, and O. Paris, Capillarity-driven deformation of ordered mesoporous silica. Applied Physics Letters, 2009. 95(8): p. 083121; [3] Balzer, C., T. Wildhage, S. Braxmeier, G. Reichenauer, and J.P. Olivier, Deformation of Porous Carbons upon Adsorption. Langmuir, 2011. 27(6): p. 2553-2560; DOI: 10.1021/La104469u.

CM P05

Characterization of Li charging state of Li₁₋ₓCoO₂ battery cathodes by means of SQUID magnetometry Gregor Klinser, Stefan Topolovec, Heinz Krenn (2), Harald Kren, Stefan Koller and Roland Würschum Graz University of Technology, Institute of Materials Physics, Petersgasse 16, 8010 Graz (2) University of Graz, Institute of Physics, Universitätsplatz 5, 8010 Graz Research in the field of modern battery materials demands for characterization techniques which may yield insight in the atomistic processes of battery charging and discharging. In the present work SQUID magnetometry is used in order to study the battery cathode material Li₁₋ₓCoO₂ in dependence of the degree of charging. For this purpose, samples with various degrees of lithium concentration were prepared. The Li-content was adjusted by electrochemical charging. Sample handling and measurements were performed under protective argon atmosphere. Paramagnetic behavior of Li₁₋ₓCoO₂ is observed which is considered to be caused by the interplay of competing magnetic interactions (Curie-Weiss-, Van Vleck- and Pauli paramagnetism). The dominant Curie-Weiss behavior shows a systematic and mostly linear increase of the localized magnetic moment with decreasing Li-content down to Li₀ˌ₆CoO₂. The observed localized magnetic moment cannot exclusively be attributed to Co⁴⁺ ions which are formed by oxidation of Co³⁺ upon Li extraction, but also exchange coupling between Co³⁺ᵟ-O²⁻ᵟ pairs is supposed to play a role. Further de-intercalation of Li (x < 0.6) results in a decrease of the magnetic moment which may be associated with structural changes. In fact, in the same concentration range, a reordering of Li-vacancies could recently be detected by means of positron annihilation spectroscopy [1]. [1] P. Parz, B. Fuchsbichler, S. Koller, B. Bitschnau, F. Mautner, W. Puff and R. Würschum, Appl. Phys. Lett. 102, 151901 (2013).

24

Transport simulations of Dirac Fermions on surfaces of topological insulators

CM P06

Walter Poetz and Magdalena Schreilechner Uni Graz, Universitätsplatz 5, 8010 Graz Experimental progress has made possible to detect signatures of electron transport associated with surface states of topological insulator (TI) surfaces. We have recently developed a numerical scheme which allows the simulation of Dirac fermions on a grid without fermion doubling. We have used this scheme to simulate the pure-state dynamics of Dirac fermions in selected electro-magnetic textures acting as Dirac fermion beam splitters and interferometers. More recently, we have extended this scheme to deal with a mixed-state dynamics within the density matrix formulation. This puts us in the position to model genuine spin-selective transport scenarios for Dirac fermions on TI surfaces within the von Neumann and Lindblad equation and thus to make contact with experiment. In this poster we will first discuss the avoidance of fermion doubling with a staggered grid and its implementation into the Lindblad (von Neumann) equation for an effective (2+1)D Dirac Hamiltonian. Gauge invariant formulation will be addressed. The scheme will be demonstrated for simple elementary static and time-dependent electromagnetic textures, such as Klein steps, magnetic domain walls, and magnetic vortices. The simulation of absorbing boundary conditions using imaginary potentials, as well as Ohmic boundary conditions using Lindblad operators, will be shown.

Inelastic close coupling calculations reproducing temperature dependency of helium atom scattering experiments on pnictogen surfaces

CM P07

Christian Gösweiner, Patrick Kraus, Florian Apolloner, Salvador Miret-Artès and Wolfgang E. Ernst Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz The peculiar properties of two dimensional conductance and prohibited backscattering in the newly discovered materials class of topological insulators (TI) have recently renewed interest in the properties of pnictogens [1]. Especially the elements antimony (Sb) and bismuth (Bi) provide the main building blocks for the whole range of known Tis such as Bi2Se3, Bi2Te3, Sb2Te3 or BiSb. Being a completely surface sensitive technique, helium atom scattering (HAS) is ideally suited for investigating structural, vibronic and even electronic surface properties. Earlier investigations on Bi(111) and Sb(111) using HAS and approximative elastic analysis methods such as the Eikonal approximation revealed an unexpectedly large surface electronic density corrugation that would not be expected for surfaces with such prominent surface conducting properties. [2, 3, 4] Using quantum mechanically exact approaches such as the CloseCoupling (CC)-Method a fundamental analysis of the particle-surface interaction is possible. Furthermore, this approach can be extended to include inelastic interactions [4, 5]. Using the elastic CC method, a detailed picture of the He-Sb and He-Bi interaction potential has been determined. However, when extending the CC approach to inelastic contributions at several surface temperatures, a strong deviation from the usual Debye-Waller behavior is observed. This deviation from the expected behavior however succeeds in describing high-temperature angular HAS scans on Bi(111) when assuming a far lower surface electronic density corrugation. The additionally introduced inelastic scattering channels provide a second dominant way of reaching the elastic scattering channels and progressively alter the scattered intensity profile when reaching higher temperatures. The lack of this mechanism in elastic approaches leads to a severe overestimation of the static electronic density corrugation. HAS experimental data as well as elastic and inelastic CC calculations in comparison to earlier elastic analysis methods will be presented. [1] [2] [3] [4] [5]

H. Zhang et al., Nature Physics 5 (2009) 438-442 M. Mayrhofer-R., J. Phys. Condens. Matter 24 (2012) 104008 M. Mayrhofer-R., J. Phys. Condens. Matter 25 (2013) 395002 M. Mayrhofer-R., Phys. Rev. B 88 (2013) 205425 A.S. Sanz and S. Miret-Artés, Phys. Rep. 451 (2007), 37-154

25

CM P08

Development of a molecular beam for surface reactivity studies Daniel Halwidl, Jiri Pavelec, Jan Hulva, Florian Brunbauer, Michael Schmid, Gareth Parkinson and Ulrike Diebold Vienna University of Technology, Institute of Applied Physics, Wiedner Hauptstrasse 8-10/134, 1040 Wien An effusive molecular beam was developed to allow the dosing of gases, liquids and solids in the “Machine for Reactivity Studies” (MRS), a newly constructed UHV setup designed to investigate surface chemistry of bulk metal oxide samples. One of the techniques used in the MRS is Temperature Programmed Desorption requiring the adsorption of precise and reproducible doses to a defined area on the samples. The main components of the molecular beam are a thin walled source orifice of 50 µm diameter and a beam defining aperture of 2 mm diameter. The molecular beam is differentially pumped and can be chopped by a mechanical shutter. The theoretical profile of the molecular beam has a core diameter of 3.5 mm and a variable core pressure up to the order of 10-6 mbar, while the background pressure of the beam is 4 orders of magnitude lower. The beam profile was experimentally confirmed and core pressures between 1.7x10−8 mbar and 2.9x10−6 mbar were measured.

CM P09

Contact charging of mineral particles studied by Kelvin Probe Force Microscopy Stefan Klima, Monika Mirkowska and Christian Teichert Montanuniversität Leoben, Franz-Josef-Straße 18, 8700 Leoben Contact charging of mineral particles is most important for the industrial applied triboelectrostatic separation (TS). During TS, charge is transferred between touching particles yielding positive/negative net charges on the particles. Subsequently, the particles are separated in an electric field. However, the mechanism of charge transfer is not completely understood. As a model system, we investigated the charging behaviour of a single micrometer size mineral particle touching an insulator calcite (100) surface. For this purpose, a combination of Atomic Force Microscopy (AFM) and Kelvin probe force microscopy (KPFM) was employed. First, a mineral particle attached to the tip of an AFM cantilever was rubbed in contact mode on a calcite single crystal surface with different contact forces and at different temperatures. Subsequently, KPFM was employed to monitor changes in surface potential.

CM P10

Setup of the machine for reactivity studies Jiri Pavelec, Daniel Halwidl, Jan Hulva, Michael Schmid, Gareth Parkinson and Ulrike Diebold Vienna University of Technology, Institute for Applied Physics, Wiedner Hauptstr. 8-10/134, 1040 Vienna The Machine for Reactivity Studies is a newly constructed UHV setup optimized to characterize properties driving surface chemistry of metal oxide samples. Temperature Programmed Desorption (TPD) is combined with Ultra Violet Photoemission Spectroscopy, Photoemission Spectroscopy with a monochromatic X-ray source, Low Energy Electron Diffraction, and Ion Scattering Spectroscopy, allowing reaction intermediates to be determined as a function of temperature. TPD requires the adsorption of atoms or molecules on sample surfaces at low temperature. However, to ensure good thermal contact between the metal oxide single crystal and sample holder, it is necessary to clamp the sample with a retaining frame. For high quality TPD spectra the direct dose to the retaining frame should be as low as possible. Therefore, a Molecular Beam (MB) is used to evenly adsorb molecules on a well-defined area of the sample surface only. All installed high resolution spectroscopies complement ongoing scanning tunneling microscopy studies in the group.

26

CM P11

AFM morphology investigation of pentacene films in electrodedielectric transition area Michael Hollerer, Roman Lassnig, Adolf Winkler, Bernd Striedinger (2), Alexander Fian (2) and Barbara Stadlober (2) TU Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz (2) Institut für Oberflächentechnologien und Photonik, Joanneum Research, Graz While today most commercial electroni c devices are based on inorganic semiconductor technology currently huge efforts are made to realize high-performance organic devices. Although functional devices employing conjugated organic molecules had already been demonstrated, the underlying principles of the charge transport mechanisms are not yet fully understood. With our setup we are able to fabricate gold bottom-contact pentacene field effect transistors on a SiO2 dielectric using highly p-doped silicon as a substrate. During the fabrication process under ultra-high vacuum conditions, electrical characterization as well as Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) are accessible to gain a better understanding on film formation in the 25 µm channel. Treating the substrate with argon ion sputtering and/or TDS measurements we can establish a very well-defined substrate surface to achieve highly reproducible and therefor significant data for charge transport analysis. Additionally the possibility of precisely controlling the sample temperature from 125K up to 800K complements the unique setup. The emphasis of this work is the investigation of pentacene layer growth in the SiO2-gold transition area with ex-situ AFM measurements. Since only the first couple of monolayers are reported to contribute to the charge transport the information on the microscopic pentacene-gold contact formation is crucial. Manufactured devices show deviating behavior from theoretical models assuming abrupt semiconductor-metal transitions. For this reason the contact-resistance dependence on the film thickness and the sample temperature during the deposition processes are subject of our investigations.

CM P12

AFM studies of adsorbed xylan on amorphous cellulose films using functionalized tips Caterina Czibula, Christian Ganser, Albrecht Miletzky, Stefan Spirk, Robert Schennach and Christian Teichert Institute of Physics, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben Xylan is the predominant hemicellulose in plants and wood. It is a byproduct in papermaking and the production of regenerated cellulose fibers. To find an additional use of xylan, its ability to positively influence mechanical properties of paper is investigated. However, pulp fibers are an inhomogeneous and complicated system. Therefore, the adsorption of xylan to amorphous cellulose thin films was studied as a first step. The films were prepared on quartz-crystal-microbalance substrates and exposed to a solution of xylan (c = 1 g/L) at pH 8 with varying ionic strengths. Atomic force microscopy (AFM) was employed to characterize the topography of the samples and to analyze the surface of the films chemically. To obtain chemical contrast between cellulose and xylan, OH- and CH3-functionalized AFM tips were used. In tapping mode, xylan could be identified on the surface by a shift in the AFM cantilever’s oscillation phase. Additionally, AFM force mapping allows to locally record the adhesion force between functionalized tip and surface. This technique yields an even higher contrast between xylan and cellulose than the phase shift does. The size of the randomly distributed xylan aggregates varies between 20-30 nm and the shape, either globular or elongated, is dependent on the electrolyte concentration. The adhesion force between the tip and the adsorbed xylan is about 5 – 10 nN lower than for the cellulose film with both functionalizations. Both techniques, phase contrast and force mapping with functionalized tips, have been demonstrated as reliable AFM methods to obtain chemical information of the surface and to detect differences between xylan and cellulose.

CM P13

Switching single molecules on a metal surface Simon Jaekel, Knud Seufert, Christophe Nacci and Leonhard Grill University of Graz, Department of Physical Chemistry, Heinrichstrasse 28, 8010 Graz Functional molecules play a key role in nanotechnology and are of interest in various fields from molecular electronics to molecular machines. A prototype of a functional molecule is a molecular switch that exists in at least two stable states that can be achieved reversibly, each exhibiting characteristic physical and chemical properties. In this work we study such entities at the level of single molecules by scanning tunneling microscopy under ultrahigh vacuum conditions [1]. The single-molecule approach is of great importance since it enables to determine the role of the local environment on chemical processes as well as to visualize and quantify that the atomic-scale surroundings cause drastic changes in the switching probability of individual molecules, leading to periodic switching patterns [2]. Furthermore, we show that the rate of an intramolecular hydrogen transfer reaction can be tuned up and down by single atoms in the vicinity of the molecule, realizing the ultimate size limit in the influence of matter on chemical processes [3]. [1] M. Alemani et al., J. Am. Chem. Soc. 128, 14446 (2006) [2] C. Dri et al., Nature Nanotech. 3, 649 (2008) [3] T. Kumagai et al., Nature Chem. 6, 41 (2014).

27

CM P14

MEMS-Magnetfeld Detektion Michael Stifter, Harald Steiner, Wilfried Hortschitz, Thilo Sauter und Franz Keplinger

Center for Integrated Sensor Systems, Danube University Krems, Viktor Kaplan Straße 2 – Bauteil E, 2700 Wiener Neustadt; Institute of Sensor and Actuator Systems, Vienna Austria University of Technology Ein neuartiges Magnetometer aus mikrobearbeitetem Silizium zum Erfassen von statischen und wechselnden Magnetfeldern wurde entwickelt und untersucht. Diese Vorrichtungen bestehen aus meist Uförmigen Miniatur-Kragbalken aus kristallinem Silizium, die einen dünnen Leiter für elektrischen Wechselstrom tragen. Dieser Cantilever bildet mit Dünnfilm-Elektroden, die in einem präzisen Abstand angebracht werden, eine durch Vibrationen variierende Kapazität. Bewegungen des Auslegers sind so bequem mit einer elektronischen Schaltung detektierbar. Jedes statische Magnetfeld ruft eine Kraft auf stromführende Leiter hervor, und im Falle eines Wechselstroms alterniert sie entsprechend der Frequenz des Stromes. Sie ist nach H.A. Lorentz benannt, einem der Pioniere des Elektromagnetismus, und wirkt senkrecht zu den Richtungen von Magnetfeld und Strom. Die Kenntnis der Stromstärke vorausgesetzt, ist die Auslenkung des Balkens ein Maß für die Komponente der magnetischen Flussdichte, die senkrecht zu dem Strom zeigt. Durch das Ändern der Stromstärke kann die Empfindlichkeit des Magnetometers angepasst werden, wodurch mit einem Balken mehr als sechs Größenordnungen der Feldstärke messbar sind. Die höchsten Schwingungsamplituden sind natürlich in der Nähe der Resonanzfrequenzen des mikrobearbeiteten Struktur zu erwarten. Welche Resonanzmoden angeregt werden können, hängt von der Konfiguration des Feldes, der Frequenz des Stromes und der Formgebung der resonanten Struktur ab. In den Experimenten wurde der Schwerpunkt auf die Untersuchung des ersten symmetrischen, des ersten antisymmetrischen und des zweiten symmetrischen Schwingungsmodus gelegt. Die resonante Anhebung von Schwingungsamplituden wird durch die Güte, die im Vakuum leicht über einen Wert von 10⁴ steigt, ausgedrückt. Bei Normaldruck sind jedoch Werte von der Größenordnung von 10² typisch, was ein Hinweis auf die große Bedeutung der Gasreibung ist. Physikalische Modelle der Gasreibung, die für einen weiten Druckbereich Gültigkeit haben, zu erstellen ist eine äußerst komplexe Aufgabe, die auf der Grundlage einer umfassenden experimentellen Studie für Drücke vom 10⁻⁷ fachen bis zum 10⁻³ fachen des Normaldrucks durchgeführt wurde. Signifikante Verbesserungen des Standes der Technik wurden in dem Druck-Regime, wo die mittlere kollisionsfreie Weglänge der Gasteilchen das 0,02 bis 10-fache des charakteristischen Abstands der mechanischen Anordnung misst, erzielt. Zusätzlich zur kapazitiven Abtastung der Magnetfeld-induzierten Vibrationen des Balkens wurde dessen Bewegung auch mit einem Laser-Doppler-Vibrometer abgetastet. Die erreichte Auflösung für Magnetfelder reichte je nach Anordnung bis zu 0,3 ‰ des Erdmagnetfeldes. Ein bisher unbekannter Störeffekt, welcher durch die AusleseKapazitäten in Verbindung mit dem elektrischen Widerstand der Stromzuführung auf dem Ausleger induziert wird, wurde entdeckt. Dieses komplexe Zusammenspiel wurde im Detail untersucht, da dieser Effekt die erzielbare Auflösung in bestimmten Fällen stark einschränken kann.

28

FAKT Mittwoch/Wednesday, 24.09.2014, 10-13, 14-18:30, Festsaal RAIKA

Zeit time

ID

10:00

FAKT T11

FAKT, Fundamental interactions Chair: Eberhard Widmann Latest results of the CRESST-II experiment Achim Gütlein and Holger Kluck Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Nikolsdorfer Gasse 18, 1050 Wien CRESST-II is a cryogenic direct dark matter search experiment based on scintillating calcium tungstate crystals operated at mK temperatures. CRESST-II is aiming for the detection of weakly interacting massive particles (WIMPs) via their elastic scattering off nuclei in the target crystals. By the simultaneous measurement of the heat signal and the scintillation light produced by incident particles in the calcium tungstate crystals particle identification and background suppression is possible on an event-by-event basis. Significant improvements have been achieved with respect to previous measuring campaigns in terms of the intrinsic radiopurity of calcium tungstate crystals and the rejection of recoil events from alpha decays near the inner surfaces of the detector modules. In this work, the related changes in the detector design will be discussed. Based on the first 29 kg-live-days of data acquired by a single detector module of a new design, we will present limits for the spin-independent WIMP-nucleon cross section down to WIMP masses of 1 GeV.

10:15

Search for the violation of the Pauli Exclusion Principle with electrons

FAKT T12

Andreas Pichler, Hexi Shi and Johann Marton Stefan-Meyer Institut für subatomare Physik, Boltzmanngasse 3, 1090 Vienna Formulated by Wolfgang Pauli in 1925 [1], the Pauli Exclusion Principle (PEP) has been the foundation for our understanding of many fields of physics where systems of fermions are concerned. Since no simple explanation for the principle exists, it remains to be a postulate open to experimental tests, which are difficult as there is no well-established theory to predict a violation in a quantitative way. However, there have been high precision experiments searching for a possible PEP violation in the framework of Quantum Mechanics. In a pioneering experiment, Ramberg and Snow [2] supplied electric current to a Cu target, and searched for PEP violating atomic transitions of the “fresh" electrons from the current. The non-existence of the anomalous X-rays from such transitions then set the upper limit for a PEP violation. Following this method, the VIP (VIolation of Pauli Exclusion Principle) experiment improved the sensitivity due to high resolution X-ray detectors and background suppression in the Gran Sasso underground laboratory (LNGS). It obtained an upper limit at the level of 10-29 [3, 4] for the probability that an external electron captured by a Cu atom can de-excite to the 1s state already occupied by two electrons. In the talk, the experiment and the results will be presented. The preparation of the follow-up experiment VIP-2 planned at Gran Sasso [5], aiming to increase the sensitivity by two orders of magnitude, will also be discussed. This project is partly supported by the FWF project P25529-N20. [1] [2] [3] [4] [5]

W. Pauli, Z. Phys. 31, 765(1925); E. Ramberg and G.A. Snow, Phys. Lett. B238, 438{441(1990); S. Bartalucci, et al: Phys. Lett. B641, 18{22(2006); C. Curceanu, et al: AIP Conf. Proc. 1508, 136(2012); doi: 10.1063/1.4773125; J. Marton, et al: J. Phys.: Conf. Ser. 447, (2013)012070

29

10:30

FAKT T13

Measuring the ground state hyperfinestructure of antihydrogen Clemens Sauerzopf, Martin Diermaier, Bernadette Kolbinger, Sebastian Lehner, Chloé Malbrunot, Oswald Massiczek, Martin Simon, Eberhard Widmann and Johann Zmeskal Stefan-Meyer-Institut für subatomare Physik der ÖAW, Boltzmanngasse 3, 1090 Wien The amount of matter-antimatter asymmetry observed in the universe today still can not be explained by the standard model of particle physics. This asymmetry is linked to the most fundamental property in particle physics, the CPT (Charge, Parity and Time) symmetry. The ASACUSA collaboration at the Antiproton Decelerator (AD, CERN) aims to test the CPT symmetry by measuring the ground state hyperfine splitting of antihydrogen and comparing it to its normal matter counterpart, hydrogen [1]. The limited rate in antihydrogen production for a beam [2] imposes tough requirements and constrains on simulations and detectors used to measure the hyperfine splitting. In this talk we will discuss the arising challenges, both in detector design and development of sophisticated methods for simulating the whole beamline from the antihydrogen source in the cusp to the detection of annihilation products and suppression of background from cosmic particles and antiproton annihilations inside of the trap. [1] C. Malbrunot et. al., Hyperfine Interactions, February 2014, 1-6 (2014). [2] N. Kuroda et. al., Nature Communications 5, 3089 (2014).

10:45

FAKT T14

Hyperfine spectroscopy setup for antihydrogen and first results with a hydrogen beam Martin Diermaier, Peter Caradonna, Christoph Klaushofer, Chloe Malbrunot, Oswald Massiczek, Clemens Sauerzopf, Martin Simon, Michael Wolf, Johann Zmeskal and Eberhard Widmann Stefan-Meyer Institute, Boltzmanngasse 3, 1090 Vienna The ASACUSA collaboration aims to measure the ground state hyperfine splitting of the antihydrogen atom, since this is a system where the CPT symmetry can be investigated with extremely high sensitivity. The principal idea is described in [1, 2]. During the CERN LS1 shut down, antiprotons were not available. Therefore, a source of cold, polarized, and modulated atomic hydrogen has been constructed to enable comprehensive testing of the Rabi-like experimental setup consisting of a microwave spin flip cavity and superconducting sextupole magnet [3]. After shortly discussing the main components of the atomic hydrogen source and detector as well as the spectroscopy beamline I will present the latest experimental data, which allowed for a characterization of the focusing effect of the superconducting sextupole magnet and the resonance line shape of the spin flip cavity. Furthermore, a confirmation of the proposed measurement principle for the hyperfine splitting of antihydrogen was achieved by the determination of the ground state hyperfine splitting of atomic hydrogen with a precision on the 10 ppb level. [1] E. Widmann et al., Hyperfine Interactions, 215, 1-8 (2013) [2] N. Kuroda et al., Nature Communications, 2089, 5 (2014) [3] C. Malbrunot et al., Hyperfine Interactions, (2014) DOI: 10.1007/s10751-014-1013-z

30

11:00

FAKT T15

Precision measurements of neutron beta decay Gertrud Konrad TU Wien, Atominstitut, Stadionallee 2, 1020 Wien Precision measurements of the parameters describing the beta decay of free neutrons address important questions in nuclear and particle physics, astrophysics, and cosmology. Our main emphasis is on the search for evidence of possible extensions of the Standard Model and on searches for new symmetry concepts. Together with scientists from the Universities of Heidelberg and Mainz, the TU München (all Germany), and the Institut LaueLangevin (ILL) in Grenoble (France), we propose to perform next generation high-precision measurements with the new instrument PERC (Proton and Electron Radiation Channel). In the search for new symmetries, measurements of correlation coefficients, inter alia a, A, B, C, and the Fierz interference term b, are of uttermost importance: unitarity of the CKM matrix, left-right symmetry, leptoquarks, supersymmetry, etc. PERC is under development by an international collaboration. Until PERC is built and installed at the ForschungsNeutronenquelle Heinz Maier-Leibnitz in Garching (Germany), we perform precision measurements of neutron decay observables with the existing aSPECT and PERKEO III experiments at ILL: With a measurement in 2013 the aSPECT Collaboration aims to improve the uncertainty on the correlation coefficient a to 1% (literature value 5%). The data analysis is still ongoing. At present, the PERKEO III Collaboration measures the proton C and neutrino asymmetry parameter B, to improve the bounds for mass and mixing angle of a hypothetical new gauge boson mediating right-handed currents. In this talk, I will present an overview of our current and planned research projects.

11:15 11:44

Kaffeepause / Coffee break

Zeit time

ID

11:45

FAKT T21

FAKT, Fundamental interactions Chair: Christoph Schwanda qBOUNCE: Frequency's view on Newton's Law Gunther Cronenberg, Hanno Filter, Peter Geltenbort, Tobias Jenke, Martin Thalhammer and Hartmut Abele Vienna University of Technology, Stadionallee 2, 1020 Vienna In the frame of the qBOUNCE experiment, resonant transitions between several of the lowest quantum states of gravitationally bound neutrons are observed for the first time. The coupling between the states is provided by well-defined mechanical oscillations of the confining neutron mirrors boundary conditions [1]. The Rabi-like setup in the latest generation is improved by renouncing the upper confining mirror. The presented spectroscopy method enables a frequency’s view on Newton’s Inverse Square Law of Gravity, which has been put under scrutiny by theoretical extensions of the Standard Model. As yet undiscovered particles of dark matter or dark energy would introduce a measurable energy shift, we can present experimental limits for dark-energy chameleons fields and the pseudo-scalar interaction of an axion, a prominent dark matter particle [2]. The method allows testing the weak equivalence principle (WEP) for a quantum system in the sub-millimeter regime of space-time. The weak equivalence principle is a corner stone of our understanding of gravitation, which is being challenged by emerging theories. [1] Jenke, T., Geltenbort, P., Lemmel, H., & Abele, H., Nature Physics, 7(6) (2011), 468– 472 [2] Jenke, T., Cronenberg G., Burgdörfer, J., et al. (2014), Physical Review Letters 112, 151105

31

12:00

FAKT T22

Oscillations in the exponential power-law in electron capture decays of hydrogen-like ions Christoph Klaushofer and Paul Bühler Stefan Meyer Institute for Subatomic Physics, Boltzmanngasse 3, 1090 Vienna In 2008 in the cooler-storage ring ESR of the accelerator facility GSI oscillations in the exponential decay of hydrogen-like atoms were found. These results were obtained by analysis of the electron-capture decays of 140Pr59+ and 142Pm60+. The oscillations were confirmed with an additional experiment which was performed with the same ions in 2010 using a much improved pick-up device with better sensitivity and time resolution. A consistent explanation of these observations is still outstanding. A similar experiment was performed with 122I52+ and thereafter manually analyzed. As an independent approach we have been working on the development of an automatized method for the analysis of individual decays. Since the noise in the data is very high, new analysis techniques had to be developed. I will give an overview of the experimental setup and the results that have been achieved so far. Furthermore I will elaborate on the computational methods we developed for the analysis of 122I52+ and compare the results to the manual analysis of the same data.

Zeit time

ID

12:15

FAKT T23

FAKT, Theory: Gravity Chair: NN Conformal gravity holography in four dimensions Daniel Grumiller, Maria Irakleidou, Iva Lovrekovic and Robert McNees Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/136, 1040 Vienna We formulate four-dimensional conformal gravity with (Anti-)de Sitter boundary conditions that are weaker than Starobinsky boundary conditions, allowing for an asymptotically subleading Rindler term concurrent with a recent model for gravity at large distances. We prove the consistency of the variational principle and derive the holographic response functions. One of them is the conformal gravity version of the Brown–York stress tensor, the other is a ‘partially massless response’. The on-shell action and response functions are finite and do not require holographic renormalization. Finally, we discuss phenomenologically interesting examples, including the most general spherically symmetric solutions and rotating black hole solutions with partially massless hair.

12:30

FAKT T24

Canonical charges and asymptotic symmetries in four dimensional conformal gravity holography Daniel Grumiller, Maria Irakleidou, Iva Lovrekovic, Robert McNees and Florian Preis Vienna University of Technology, Institute of Theoretical Physics, Wiedner Hauptstrasse 8-10, 1040 Wien Using canonical analysis of four dimensional conformal gravity we determine the constraints which via Castellani algorithm lead to gauge generators and define variation of charges. Boundary conditions required for well defined variational principle provide charges to be integrable. Conformal charge is zero due to conformal invariance while the remaining two are non-trivial and generate asymptotic symmetries. To conclude, we study the influence of the boundary conditions that are weaker than Starobinsky boundary conditions in particular the asymptotically subleading Rindler term on asymptotic symmetry group. The full conformal group is obtained only in the case when this term is zero while changing the rank and coordinate dependence in the term reduces conformal group to its subgroups.

32

12:45

FAKT T25

Higher-Spin Gravity in 2+1 Dimensions Max Riegler Vienna University of Technology, Wiedner Hauptstrasse. 8, 1040 Wien Higher-Spin Gravity in 2+1 Dimensions is a very active research topic that gained a lot of attention in the last few years. The basic idea is to employ the holographic principle on spacetimes which are endowed with more symmetries than just diffeomorphisms. These higher-spin symmetries yield very interesting and highly non-trivial results on the field theory side of the holographic correspondence. In this talk I will give an introduction on the basic Ideas of higher-spin gravity and the holographic principle in 2+1 dimensions and will provide the first explicitly worked out example of higher-spin holography in 2+1 dimensions of a spacetime which is not Anti-de Sitter i.e. a spacetime with constant negative curvature. Since recently there has also been a lot research and progress been made on flat space higher-spin holography in 2+1 dimensions I will also briefly explain the basic ideas and some novel No-Go results on the relation higher-spin+flat space+unitarity we have obtained.

13:00 13:59

Mittagspause/Lunch break

Zeit time

ID

14:00

FAKT T31

FAKT, Theory: Gravity Chair: NN Numerical relativity in asymptotic anti-de Sitter spacetimes Christian Ecker Vienna University of Technology, Wiedner Hauptstrasse 8-10/136, 1040 Vienna We focus on the numerical simulation of non-stationary asymptotic anti-de Sitter (AdS) spacetimes – a certain class of solutions to Einsteins equations with negative cosmological constant. After introducing asymptotic AdS spacetimes and the anti-de Sitter / Conformal Field Theory (AdS/CFT) correspondence, the holographic framework is demonstrated on the numerical simulation of the thermalization process of a strongly coupled N=4 supersymmetric Yang-Mills plasma. Further we discuss the holographic computation of entanglement entropy within an initially highly anisotropic AdS black hole geometry.

Zeit time

ID

14:15

FAKT T32

FAKT, Theory: QCD Chair: NN Holographic Glueball Decay Frederic Brünner, Denis Parganlija and Anton Rebhan TU Wien, Institut für Theoretische Physik, Wiedner Hauptstraße 8-10, 1040 Vienna The Sakai-Sugimoto model is a realization of holographic QCD in the context of the AdS/CFT correspondence that allows for a description of glueballs, rho-mesons, pions and their interactions. In this talk, we discuss new results from our calculation of glueball-decay rates into pions. The predicted decay rates for the holographic glueball corresponding to a dilaton agree very well with the experimental data for the decay of the f_0(1500) isoscalar into two pions. Other results we present include the decay rate of the lowest-lying tensor glueball into two pions, which turns out to be narrow. These calculations are of high relevance to the search for glueballs, especially in light of the upcoming PANDA experiment at FAIR.

14:30

FAKT T33

Effective mass signatures in multiphoton pair production Christian Kohlfürst, Holger Gies and Reinhard Alkofer University Graz, Institut für Physik, Mozartgasse 14, 8010 Graz Electron-positron pair production in oscillating electric fields is investigated in the nonperturbative threshold regime. Accurate numerical solutions of quantum kinetic theory for corresponding observables are presented and analyzed in terms of a proposed model for an effective mass of electrons and positrons acquired within the given strong electric field. Although this effective mass cannot provide an exact description of the collective interaction of a charged particle with the strong field, physical observables are identified which carry direct and sensitive signatures of the effective mass.

33

14:45

FAKT T34

Heavy quarkonia in a sophisticated Bethe-Salpeter-equation meson model Thomas Hilger Karl-Franzens Universität Graz, Universitätsplatz 5, 8010 Graz We investigate aspects of the effective interaction in a rainbow-ladder truncated meson model of QCD within a covariant Landau-gauge Bethe-Salpeter-equation approach. Based upon past success for the meson ground states in the bottomonium system [1], we discuss the range of applicability and features of a more general effective-interaction model, e.g. in charmonium and for radial excitations. [1] M. Blank and A. Krassnigg, PRD84 (2011) 096014

15:00

FAKT T35

A new strategy for hadron phenomenology with the DS-BS-equation approach Andreas Krassnigg Univ. Graz, Inst. f. Physik, FB Theoretische Physik, Universitätsplatz 5, Graz 8010 After a brief review of recent progress made with the Dyson-Schwinger-Bethe-Salpeter (DS-BS)-equation approach, I describe a new and promising strategy to arrive at a comprehensive and phenomenologically effective picture of hadrons and their properties. Substantial effort is made towards the thorough investigation of the effective interaction used in such hadron models, and cornerstones as well as challenges of a unified and comprehensive treatment are identified.

15:15

FAKT T36

Non-perturbative propagators and running coupling in the conformal window of QCD Reinhard Alkofer, Christian S. Fischer and Markus Hopfer Univ. Graz, Inst. of Physics, Universitätsplatz 5, 8010 Graz QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the nonperturbative tensor structures of the quark-gluon vertex.

15:30 15:59

Kaffeepause / Coffee break

Zeit time

ID

16:00

FAKT T41

FAKT, Collider physics Chair: Dietmar Kuhn ATLAS Inner Tracking detectors: Run 1 performance and developments for Run 2 Wolfgang Lukas University of Innsbruck The measurement of charge particle trajectories with the inner tracking detectors at the ATLAS experiment is a key input for higher-level object reconstructions, ranging from leptons to the identification of heavy-flavor jets. In addition the information provided by the inner tracking systems has been proven to be very powerful for disentangling the effects of several interactions occurring in the same bunch crossing (pile-up). In this contribution, we will review the performance during the Run 1 data-taking and preparation for the next run in 2015. In particular, we will show how the knowledge of the passive material inside the inner tracking acceptance has been further studied to reduce the systematic errors on the tracking efficiency, with benefits for physics measurements. In addition, the developments in disentangling close-by tracks which naturally occur in the decay of very high-pT objects (e.g. taus, or close to the core of jets) will be presented. The ongoing upgrade of the ATLAS detector includes an extra silicon layer (IBL) in the inner tracking system; the preparation for the integration of the new hardware and its expected performance will be reviewed as well. Finally, it will be presented a brief report on recent developments of the tracking software aiming for speed and disk-space optimizations.

34

16:15

FAKT T42

Measurement of the decay B->D l nu in fully reconstructed events and determination of the CKM matrix element Vcb at Belle Robin Glattauer HEPHY Vienna, Nikolsdorfer Gasse 18, 1050 Wien We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| and the form-factor slope rho^2 in B->D l nu decays based on 711/fb of Y(4S)->B Bbar events recorded with the Belle experiment at the KEKB asymmetric energy e+ e- collider in Tsukuba, Japan. B->D l nu decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. The D meson is searched for in 15 different hadronic decay channels. We measure the differential width of the decay as a function of the kinematic variable w, the product of the 4-velocities of the B and D mesons. From this distribution |Vcb| and rho^2 are extracted.

16:30

FAKT T43

Measurement of the decay B0s -> J/psi phi(1020) Lukas Lechner, Felicitas Andrea Thorne and Christoph Schwanda Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Nikolsdorfergasse 18, 1050 Wien Although the Standard Model of particle physics is one of the most successful theories it still leaves open questions, e.g. mixing angles, hierarchy of particle masses, dark matter, dark energy. Thus many experiments are searching for physics beyond the Standard Model. One possibility to investigate deviations from Standard Model predictions is the measurement of the CP violation phase phi_s, which is accessible through the decay B0s -> J/psi phi(1020). The Belle experiment at the asymmetric energy electron positron collider KEKB in Tsubaka, Japan, has collected 121.4 fb^-1 at the Y(5S) resonance, corresponding to the center-ofmass energy of 10.87 GeV, which is a world-wide unique data sample at lepton colliders. In this work the decay B0s -> J/psi phi(1020) with J/psi -> l^+ l^- (l is electron or muon) and phi(1020) -> K^+ K^- was reconstructed using the full Belle Y(5S) data sample. The reconstruction method and signal yield extraction was developed on Monte Carlo simulated events before used on the real data sample. From this results the branching fraction for the decay B0s -> J/psi phi(1020) was determined.

16:45

FAKT T44

Measurement of the decay B0s -> Ds- pi+ at the Belle experiment David Bricher, Felicitas Andrea Thorne and Christoph Schwanda Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Nikolsdorfergasse 18, 1050 Wien The decay B0s -> Ds- pi+ (charge conjugate mode is always implied) has a branching fraction of (3.04 ± 0.23) 10-3 (PDG) and thus is one of the most dominant decay modes of the B0s meson. While this decay has been studied in detail at hadron collider experiments (mainly at LHCb and CDF), there is only limited information on this decay from lepton collider experiments. The Belle collaboration has accumulated about 7.1 million Bs-Bsbar meson pairs at the asymmetric energy electron-positron accelerator KEKB in Tsukuba, Japan, at the Y(5S) resonance at a center-of-mass energy of 10.87 GeV, which is a worl wide unique data sample at lepton colliders. A detailed investigation of the decay B0s -> Ds- pi+ is of high interest for lepton colliders, as it can be used for the determination of the parameter fs which is the fraction of b-bbar states containing a B0s meson produced via the Y(5S) resonance and until today is a limiting factor for the calculation of branching fractions of Bs meson decays. In the course of this work the decay B0s -> Ds- pi+ with Ds- -> phi(1020) pi- and phi(1020) -> K+ K- has been studied on the full Belle Y(5S) data sample for the first time, including a full reconstruction of this decay on Monte-Carlo and real data and a determination of the corresponding branching ratio.

35

Zeit time

ID

17:00

FAKT T45

FAKT, Collider detectors Chair: NN Time resolution studies for the PANDA time-of-flight detector using SiPM Lukas Gruber, Stefan Enrico Brunner, Johann Marton, Herbert Orth and Ken Suzuki Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna The barrel time-of-flight detector for the PANDA experiment at FAIR in Darmstadt is planned as a Scintillator Tile Hodoscope (SciTil), composed of several thousand scintillator tiles, readout by Silicon Photomultipliers (SiPM). Such a system will be able to provide fast event timing, accurate relative time-of-flight measurements and benefits to the overall particle identification in PANDA. Requirements for the system are a time resolution better than σ = 100 ps and a minimum use of material. We present results of studies on the timing performance of a prototype SciTil detector, consisting of small plastic scintillator tiles with a size of about 30 x 30 x 5 mm³, readout from two sides using SiPM. Different scintillator materials and several types of SiPM have been investigated using a proton test beam at COSY, FZ Jülich. In the experiment, a time resolution of about 85 ps has been achieved using SiPM from Hamamatsu and Ketek with a sensitive area of 3 x 3 mm². Employing the Digital Photon Counter from Philips, a time resolution of about 45 ps could be measured. The results are promising and indicate that a time resolution well below σ = 100 ps is feasible with the proposed SciTil detector. *This work was partly supported by the EU Project HadronPhysics3 (project 283286). Special thanks to the team of Philips Digital Photon Counting for the support and participation in this research work.

17:15

FAKT T46

The Data Acquisition and Preprocessing System of the Belle II Silicon Vertex Detector Richard Thalmeier, Thomas Bergauer, Florian Buchsteiner, Friedl Markus, Christian Irmler, Katsuro Nakamura, Siegfried Schmid, Helmut Steininger and Hao Yin HEPHY Vienna, Nikolsdorfer Gasse 18, 1050 Vienna The Belle II Experiment at the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan, will explore the asymmetry between matter and antimatter and search for new physics beyond the standard model. 172 silicon detectors are arranged cylindrically in four layers around the collision point to be part of a system which measures the tracks of the collision products of electrons and positrons. They are double-sided with orthogonally arranged strips to obtain both coordinates. A total of 1748 radiation-hard APV25 chips read out 128 silicon strips each and send the analog signals by time-division multiplexing over an approximately 12 meter long copper cable out of the radiation zone to to Flash Analog Digital Converter Modules (FADC). In each of the 48 FADC modules there are 48 analog-to-digital converters, one per APV25chip plus some spares, and one Field Programmable Gate Array (FPGA), namely an Altera Stratix IV GX. It compensates line signal distortions using a digital FIR filter, recognizes data frames from the incoming stream, extracts the analog strip signals and reorders them to reflect the physical arrangement correctly. Then, Pedestal Subtraction, Common Mode Correction to eliminate DC offsets, and Zero Suppression to discard empty strip data follow. Finally, the peak timing and amplitude are extracted from a set of several data points for each hit, using a lookup table. Eventually, the processed data are sent to a computing farm for high-level analysis.

17:30 FAKT

FAKT Versammlung

18:30 Ende der Veranstaltung / End of session

18:30

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau 19:00 20:00

A T01

Univ.-Prof. Dr. Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald Die Energiewende Deutschlands – wohin wird sie führen?

36

FAKT Poster Donnerstag / Thursday, 25.09.2014, 18-19:30, Schloss Pöllau

ID

FAKT P01

FAKT, Poster Chair: NN Simulations for the measurement of the groundstate hyperfinestructure of antihydogen Clemens Sauerzopf Stefan-Meyer-Institut für subatomare Physik der ÖAW, Boltzmanngasse 3, 1090 Wien Charge, Parity and Time (CPT) symmetry is the most fundamental theoretical concepts in particle physics. The ASACUSA-Hbar collaboration aims to test this property by measuring the hyperfine structure in ground state antihydrogen [1]. Due to the big challenge in producing a beam of antihydrogen [2] sophisticated simulations are needed. Especially tracking of antihydrogen atoms through magnetic fields, atomic processes like Stark effect and Zeemann splitting, microwave transitions in a cavity and antiproton annihilations are required. To achieve this the particle physics toolkit Geant 4 [3] is used as a basis for developing a modular easily usable framework for simulating the ASACUSA antihydrogen beamline, the detectors and the hyperfine transitions within the microwave cavity. The presented work describes the current status of this simulation framework and gives an overview on the challenges that arise when introducing low energy processes and testing the antiproton annihilation codes within Geant 4. [1] C. Malbrunot et. al., Hyperfine Interactions, February 2014, 1-6 (2014). [2] N. Kuroda et. al., Nature Communications 5, 3089 (2014). [3] J. Allison et. al., IEEE Transactions on Nuclear Science, 53 No. 1, 270-278 (2006)

FAKT P02

A detector for in-beam measurements of the groundstate hyperfinestructure of antihydrogen Clemens Sauerzopf Stefan-Meyer-Institut für subatomare Physik der ÖAW, Boltzmanngasse 3, 1090 Wien Producing a beam of antihydrogen, as published by the ASACUSA-Hbar collaboration [1], imposes some big experimental challenges that limit the production rate. Therefore a suitable detector needs to have very good suppression of background events. The main sources of background are upstream annihilations of antiprotons within the cusp and cosmic particles penetration the detector. These background sources are addressed by surrounding a central detector with two hodoscope layers and the requirement to trigger only if the detector records a hit in both hodoscope layers and the central detector. Additionally basic vertex reconstruction to discriminate between different quantum states of the antihydrogen atoms after the spin selection sextupole is possible. This allows to use the same detector for initial beam and trap diagnosis as well as for the final measurement of the groundstate hyperfinestructure of antihydrogen [2]. This work displays the current state of the detector and trigger developments in preparation for the upcoming beamtime in Autumn 2014 at the CERN AD facility. [1] N. Kuroda et. al., Nature Communications 5, 3089 (2014). [2] C. Malbrunot et. al., Hyperfine Interactions, February 2014, 1-6 (2014).

FAKT P03

Non-Standard Model physics in neutron beta decay Daniel Moser, Gertrud Konrad and Hartmut Abele TU Wien, Atominstitut, Stadionallee 2, 1020 Wien Within the Standard Model (SM) of particle physics, the decay of the free neutron is solely described by the V-A theory. Nevertheless the SM cannot provide an explanation for most important phenomena. Neutron beta decay experiments may find a solution within a theory which is based on simple symmetry principles. Examples are left- and right-handed currents as extensions of the SM. We present two methods to investigate the sensitivity of neutron beta decay correlations on non SMcurrents. One way to do this is to examine the sensitivity of the correlation coefficients of the neutron beta decay in dependence on the respective currents. The other way is the method of least squares applied on the particular models. With these two methods one can check how well the previous measurements of the correlation coefficients are correlated in the models. One can also investigate improvements of measurements and their influence on limits of the SM and its extensions (future limits). The focus of this poster will be on the SM and extensions with left-handed scalar and tensor, right-handed scalar and tensor, and right-handed vector and axial vector (left-right symmetric model) currents.

37

FAKT P04

Left-right symmetry in neutron beta decay Michael Klopf, Gertrud Konrad, Wilfried Mach, Heiko Saul, Xiangzun Wang and Hartmut Abele TU Wien, Atominstitut, Stadionallee 2, 1020 Wien In 1957 an experiment performed by Goldhaber et al. indicated that the neutrino emerges solely as a lefthanded particle. In the Standard Model (SM) of particle physics this observation is described within the VA theory. Spontaneous symmetry breaking of the corresponding Lagrangian predicts the masses of the involved gauge bosons W and Z. Various left-right symmetric models, based on the gauge group SU(2)RxSU(2)LxU(1)B-L, forecast the existence of a right-handed neutrino at higher energy scales, including the respective gauge bosons WR and ZR. Precision experiments in neutron beta decay yield an excellent environment to search for right-handed currents. Measurements of various decay parameters can be compared with the SM predictions as well as with the respective left-right symmetric extension. In order to test for contributions of right-handed currents at least three parameters need to be determined with high precision. This year the PERKEO III experiment is going to measure the proton asymmetry parameter C and the neutrino asymmetry B with a relative goal accuracy of 0.2 %. The measurement principle as well as various technical details will be presented on this poster.

FAKT P05

Investigation on Possibilities for Prompt Gamma Imaging Florian Pipper, Johann Zmeskal, Johann Marton, Andreas Pichler and Dominik Steinschaden Austrian Academy of Sciences, Stefan Meyer Institute, Boltzmanngasse 3, 1090 Vienna In situ methods of dose verification for ion therapy are still in development. A promising approach is the measurement of prompt gamma ray emission following nuclear reactions, which can be correlated to the Bragg peak. This technique is known as prompt gamma imaging (PGI). An important topic for PGI is the ideal positioning of the detector. Recent simulations indicate a non-trivial angular dependency of prompt gamma intensities in certain ranges of emission energy. Measurements of the angular distribution using a slit collimated HPGe detector and various primary ion energies are in preparation. One of the possible detector concepts for PGI is the Compton camera, which consists of one detector for Compton scattering and one for photo-absorption. In order to increase the detection efficiency of such a device, the use of a liquid xenon GEM as scatter detector is being studied. This approach might also be suitable for hybrid imaging systems involving other secondary particles.

FAKT P06

Determination of the Pion Sigma scattering lengths from the charmed Lambda to Sigma pi pi decay using Belle data Manfred Berger, Ken Suzuki, Christoph Schwanda, Thorne Felicitas and Robin Glattauer Stefan-Meyer-Institut für Subatomare Physik, Boltzmanngasse 3, 1090 Vienna The Lambda (1405) resonance can be described as KbarN meson-baryon quasi bound state strongly coupled to Sigma pi. The KN reaction around the threshold is reasonably well constrained. However, in order to understand the resonance and kaonic nuclei a subthreshold extrapolation is necessary and in particular the Sigma – pi amplitude is still afflicted with large uncertainty. In this light a method analogue to Cabibbo’s[1] determination of the pion scattering length from the K+ to pi+ pi0 pi0 process has been proposed [2] using the weak charmed Lambda to Sigma pi pi decay. The high luminosity of the Belle experiment offers an opportunity to put this method into practice. To this effect three decay modes are reconstructed. A final state interaction from a higher energy combination to a lower one, reflecting the amplitude of the scattering lengths should be observable as a cusp in the Sigma – pi spectrum around the threshold. In this report we give preliminary results for our efforts to extract these scattering lengths. [1] Nicola Cabibbo, Phys. Rev. Lett. 93 (2004) 121801. [2] Tetsuo Hyodo and Makoto Oka, Phys. Rev. C84 (2011) 035201.

38

FAKT Freitag/Friday, 26.09.2014, 9-12:15, Festsaal Raika

Zeit time

ID

09:00

FAKT T51

FAKT, Detectors and methods Chair: NN Design and setup of a high resolution X-ray detector system for the kaonic deuterium experiment at J-PARC Carolina Berucci, Michael Cargnelli, Johann Marton, Eberhard Widmann and Johann Zmeskal Stefan Meyer Institute for Subatomic Physics, Boltzmanngasse 3, 1090 Vienna The study of the KbarN system at low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. Based on the development of new X-ray detectors and on the availability of the intense kaon beam line K1.8BR at J-PARC the kaonic deuterium experiment will provide the strong-interaction level shift and width of the kaonic deuterium 1s state. The measurements of the X-ray transitions to the 1s level in kaonic deuterium will allow, together with the available results from kaonic hydrogen, to extract the isospin-dependent antikaon-nucleon scattering lengths. I will present the kaonic deuterium experiment together with Monte Carlo simulation of the setup and physics processes.

09:15

FAKT T52

Extending Bayesian evaluation methods to differential angle cross sections and spectra Georg Schnabel and Helmut Leeb TU Vienna, Wiedner Hauptstraße 8, 1040 Vienna The purpose of nuclear data evaluation is to provide best estimates together with uncertainties of physical properties of the nuclei, especially reaction cross sections and spectra. Evaluation methods based on Bayesian statistics combine the information of experiments with model knowledge in a mathematically well-founded way. Existing approaches in the fast energy region usually focus on angle integrated cross sections. However, the inclusion of differential data, i.e. differential angle cross sections and spectra, is desirable to make best use of the information available. In this contribution, we show how differential data can be consistently taken into account in the linearised Bayesian update procedure preserving physical constraints. The performance of the extended method is studied by an evaluation of Ta-181 and open issues associated with model defects are addressed. Work supported in part by Fusion for Energy (F4E) via the specific grant F4E-FPA-168.01 and the Austrian Academy of Sciences via the project IPN2013_7.

09:30

FAKT T53

Magnetische Wanderwellenresonatoren für polarisierte Neutronenstrahlen Erwin Jericha, Stefan Baumgartner, Bernhard Berger, Peter Geltenbort, Christoph Gösselsberger, Masahiro Hino, Sebastian Nowak, Tatsuro Oda, Robert Raab and Gerald Badurek TU Wien, Atominstitut, Stadionallee 2, 1020 Wien Magnetische Spinresonanz in räumlich alternierenden Magnetfeldern ermöglicht die resonante Beeinflussung polarisierter Neutronenstrahlen hinsichtlich ihrer spektralen Verteilung und ihrer zeitlichen Struktur. Durch gepulsten Betrieb solcher Resonatoren sind nahezu beliebig geformte Neutronenstrahlen generierbar. Die Flexibilität wird dabei signifikant gesteigert, wenn das gepulste Magnetfeld als magnetische Wanderwelle realisiert wird [1]. Wir stellen hier die ersten technischen Umsetzungen von magnetischen Wanderwellenresonatoren und die damit erzielten experimentellen Ergebnisse vor. Die aktuelle Entwicklung ist vor allem durch den potentiellen Einsatz in moderner Neutronenstrahlinstrumentierung motiviert. Hierzu zählen das Neutronenzerfallsexperiment PERC zur hochpräzisen Charakterisierung der schwachen Wechselwirkung über den Betazerfall der Neutronen sowie die ultraflexible Formung polarisierter Neutronenstrahlen an der zukünftigen Europäischen Spallationsquelle ESS. [1] C. Gösselsberger et al., Physics Procedia 42 (2013) 106.

39

09:45

FAKT T54

Laser photodetachment in a gas-filled RF-quadrupole for AMS Johanna Pitters, Oliver Forstner, Johannes Lachner, Johannes Lahner, Martin Martschini, Alfred Priller, Peter Steier and Robin Golser Universität Wien, Währinger Straße 17, 1090 Wien AMS (Accelerator Mass Spectrometry) is the most sensitive method for measuring trace amounts of radionuclides. There are several long-lived radioisotopes that suffer from intense interference from stable isobars. Laser photodetachment of negative atomic or molecular ions can be used for suppression of these isobars, provided that the detachment energy of the radioisotope of interest is higher than that of the unwanted isobar. By overlapping the negative ion beam with a high intensity laser beam of appropriate wavelength, the unwanted isobar is neutralized. To extend the interaction time between ions and laser, the ions are decelerated inside a gas-filled radiofrequency quadrupole where the beam is cooled down to thermal energies by collision with a He buffer gas. Such a cooler system for 30 keV negative ion beams is being realized as an extension to the AMS facility VERA (Vienna Environmental Research Accelerator) at the University of Vienna. In this talk, I will give a description of the test setup ILIAS (Ion Laser InterAction Setup) and discuss the latest experimental results concerning transmission of the ion beam through the cooler system and efficiency of laser photodetachment.

10:00

FAKT T55

Status of MedAustron – the Austrian ion therapy and research center Alexander Wastl, Adriano Garonna, Claus Schmitzer, Alexander Koschik, Matthias Kronberger, Liviu Penescu, Christoph Kurfuerst and Tobias Kulenkampff EBG MedAustron, Marie Curie Strasse 5, 2700 Wiener Neustadt MedAustron is the Austrian center for hadron therapy and non-clinical research. The accelerator design is based on the PIMMS study and features proton beams of up to 800 MeV and carbon ion beams of up to 400 MeV/u. The accelerator is currently being installed and the beam commissioning has started early 2013. The injector comprising three ECR sources, an RFQ and an IH-mode structure which have already been qualified; the synchrotron commissioning started in March 2014. Certification of the therapy accelerator following the European Medical Device Directive (MDD) is well under way with strong partners from industry involved in the process. The status of the overall facility including an overview of the recent commissioning results will be presented.

10:15 10:44

Kaffeepause / Coffee break

Zeit time

ID

10:45

FAKTT 61

FAKT, Particle theory & QCD Chair: Reinhard Alkofer Systematic studies of texture zeros in the lepton mass matrices Patrick Ludl and Walter Grimus University of Vienna, Faculty of Physics Boltzmanngasse 5, 1090 Wien The question for flavour symmetries is among the most interesting ones in flavour physics. The simplest possibility for such symmetries is the case of Abelian flavour symmetry groups, which are synonymous with texture zeros in the fermion mass matrices. In the presented work we concentrated on the lepton sector and completely classified all nonequivalent types of texture zeros in the charged-lepton and the neutrino mass matrix, both for the Dirac and the Majorana neutrino case. In particular, we also investigated those textures which involve a non-diagonal charged-lepton mass matrix. From the set of textures compatible with experiment we selected the maximally restrictive ones for further investigation. By means of numerical techniques we could estimate the predictive power of these texture zero models. It turned out that, in the case of Dirac neutrinos, texture zeros can at most predict the smallest neutrino mass and the Dirac phase of the lepton mixing matrix. In the case of Majorana neutrinos, most texture zero models are also predictive with respect to the effective neutrino mass for neutrinoless double beta decay. The main result of our analyses is that none of the viable sets of texture zeros can predict any of the already measured lepton physics observables.

40

11:00

FAKT T62

The Role of the Quark-Gluon Vertex Function in the QCD Phase Transition Markus Hopfer, Andreas Windisch and Reinhard Alkofer University of Graz, Universitätsplatz 5, 8010 Graz During the last years, intensive theoretical and experimental efforts towards a deeper understanding of the strong interactions between quarks and gluons, the fundamental fields in nature, have been made. In particular, the observed phenomena of confinement and dynamical mass generation were at the focus of many contemporary studies. Up to now, the emergence of these phenomena from the underlying fundamental theory, quantum chromodynamics (QCD), is not understood in full detail. Moreover, the transition from the confined hadronic phase to the quark-gluon plasma phase induces a sudden change in the particle masses indicating a relation between these phenomena. As confinement and chiral symmetry breaking are intrinsic properties of the strong interaction in the infrared, they are not accessible by perturbation theory. By relating the Green's functions of the theory, the Dyson-Schwinger formalism offers a non-perturbative description of the dynamics including quantum fluctuations which are mandatory in the vicinity of phase transitions. The quarkgluon vertex is one of the central objects in this context linking the Yang-Mills with the matter sector of the theory. Due to its complexity only models for this vertex are used up to now. We present results obtained from a self-consistent treatment of the quark-gluon vertex and quark propagator Dyson-Schwinger equations in Landau gauge such that relevant tensor structures can be isolated. We discuss possible applications of these results in future calculations.

11:15

FAKT T63

Gluonic three-point correlations in pure Landau gauge QCD Adrian Lorenz Blum, Reinhard Alkofer, Gernot Eichmann, Markus Q. Huber, Mario Mitter, Lorenz von Smekal, Milan Vujinovic and Richard Williams Karl-Franzens-Universität Graz, Institut für Physik, Universitätsplatz 5, 8010 Graz We solve the Dyson-Schwinger equation (DSE) for the three-gluon vertex. In a first step propagators that match lattice data are used as input to calculate the full tensor structure of the three-gluon vertex DSE. The results are in very good agreement with lattice data for this vertex. In a second step the results for the three-gluon vertex are used to solve the coupled system of ghost and gluon propagator DSEs. The changes that are induced in the gluon propagator allow us to draw a conclusion about the impact of neglected two-loop diagrams in the gluon propagator DSE. Finally the coupled system of propagator DSEs and three-gluon vertex DSE is solved.

11:30

FAKT T64

Four-fermion condensation in strongly interacting dense matter Andreas Windisch, Kai Schwenzer and Mark Alford University of Graz, Universitätsplatz 5, 8010 Graz We present the idea of four-fermion condensation in a strongly coupled system of fermionic species with differing chemical potentials. Such imbalanced systems are likely to occur in many contexts in nature, including quark matter and ultracold atoms. With largely imbalanced populations, two-fermion condensation is suppressed due to kinematic constraints, while (at strong coupling as realized in matter at accessible densities) a homogeneous and isotropic condensate made out of four fermions can overcome this restriction. We discuss the mechanism of four-fermion condensation in the framework of functional renormalization group equations by studying the four-fermion condensate in the local potential approximation.

11:45

FAKT T65

Measurement of quarkonium production cross sections at CMS Johannes Brandstetter, Ilse Krätschmer and Valentin Knünz ÖAW, Hephy Vienna, Nikolsdorfer Gasse 18, 1050 Vienna Studies of the production of c-cbar and b-bbar states are an important tool to improve our understanding of QCD and hadron formation. Quarkonia are abundantly produced in the proton collisions at the LHC, and the muon reconstruction and identification capabilities of the CMS experiment make it perfectly suited for the measurement of these states. Comparisons to the theoretical predictions are based on production cross sections and polarization. This talk will report on the most recent measurements of the differential production cross sections for quarkonia by CMS.

41

12:00

FAKT T66

Alpha-nucleus optical potentials for nuclear astrophysics Thomas Srdinko, Georg Schnabel, Doreen Melari Warjri and Helmut Leeb TU Wien, Atominstitut, Wiedner Hauptstrasse 8-10, 1040 Wien A central question of nuclear astrophysics is the understanding of the processes of nucleosynthesis which consist of networks of nuclear reactions. Optical potentials are essential ingredients for such reaction calculations. In general optical potentials are determined from elastic scattering data via adjustment of the parameters of a reasonable potential shape. This works well for neutron- and proton-nucleus optical potentials which are well known at low energies relevant for nuclear astrophysics. The situation is less satisfactory for alpha optical potentials for medium and heavy nuclei because elastic scattering at low energies is experimentally not well accessible due to the strong Coulomb suppression. In this contribution we present a microscopically based approach to alphanucleus optical potentials. Using the g-matrix parametrisation of Bauge et al. a nuclear matter optical potential is generated and combined with an adapted nuclear structure component which accounts for intermediate collective states. Apart from the Skyrme-based RPA calculations of the collective states the approach makes consistent use of the g-matrix as an effective interaction. The applicability of the approach is demonstrated by comparison with experimental scattering data of several medium to heavy nuclei. Work part of the EUROCORES project EuroGenesis supported by Fonds zur Förderung der Wissenschaftlichen Forschung (FWF) Österreich under project number I 426-N16.

12:15

Ende der Veranstaltung / End of session

42

AMP Mittwoch/Wednesday, 24.09.2014, 14:30-16.30, Festsaal Sparkasse

Zeit time

ID

14:30

AMP T01

AMP Chair: Markus Kitzler High harmonics from a radio-frequency pre-excited medium Enikoe Seres, Jozsef Seres, Georg Winkler and Thorsten Schumm Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Wien To our knowledge, high harmonic generation is the only method which can generate coherent VUV and EUV pulses at the 100 MHz repetition rate of frequency combs. However, Ti:sapphire frequency comb based HH sources suffer from the relatively low conversion efficiency of the process. This limitation originates from the high ionization potential of the gas, the ionization probability is very low. In VUV and EUV frequency combs, mainly Xe gas is used because it has the smallest ionization potential (12.1 eV) and so the highest laserto- high harmonic conversion efficiency. However, this ionization potential of Xe is still too high, especially for a source in the VUV spectral range, where we aim to create a powerful HH source. Here we report the generation of high-order harmonics in Xe gas in the perturbative regime, which has been preexcited by radio-frequency discharge and pumped directly by the output of a Ti:sapphire frequency comb.

14:45

AMP T02

Attosecond dynamics of parametric amplification at 11 nm Jozsef Seres, Enikoe Seres, Björn Landgraf (2), Boris Ecker, Bastian Aurand, Andreas Hoffmann (2), Georg Winkler, Shinichi Namba, Thomas Kühel and Christian Spielmann (2) ATI, Vienna University of Technology, Stadionallee 2, 1020 Wien (2) IOQ, Friedrich Schiller University, Jena, Germany Intense short laser pulses focused into gases lead to the generation of coherent femtosecond and even attosecond extreme ultraviolet pulses via high-order harmonic generation. The limited pulse energy can be boosted in an x-ray parametric amplifier [1, 2] showing broadband amplification suitable for few-femtosecond and sub-femtosecond pulses. Here we report the first experimental demonstration of the parametric amplification of attosecond pulse-trains at around 11 nm [3]. The experiments were performed with the 26-fs-long pulses of the JETI Ti:sapphire laser system (FSU, Jena, Germany) centered around 800 nm. The beam was focused loosely to set the intensity in the focus to 5×1015 W/cm2. Two gas jets were placed before the focus with adjustable position and distance. The seed attosecond pulse-trains were generated in one of the gas jets supplied with neon gas and were amplified in the other gas jet supplied with helium gas. The seed pulse train should be temporarily synchronized with the laser field in the amplifier. At correct synchronization, a strong beam profile narrowing and gain-length product up to 8 were observed. By varying the delay, we were able to measure the durations of the pulses (0.2 fs) within the train with unprecedented sub-5-as temporal resolution. The project was supported by the EC’s 7th Framework Program (grant 284464, Laserlab Europe HIJ-FSU0019152) and the Matsuo Foundation Japan. [1] Seres, J. et al. Nature Phys. 6, 455-461 (2010); [2] Seres, J., Seres, E. & Spielmann, C. Phys. Rev. A 86, 013822 (2012); [3] Seres, J., et al. Sci. Rep. 4, 4254 (2014)

43

15:00

AMP T03

Extreme ultraviolet light source based on intracavity high harmonic generation in a mode locked Ti:sapphire oscillator with 9.4 MHz repetition rate Enikoe Seres, Jozsef Seres and Christian Spielmann (2) ATI, Vienna University of Technology, Stadionallee 2, 1020 Wien; ( 2) IOQ, Friedrich Schiller University, Jena; Helmholtz Institute Jena, Jena, Germany We report on the realization of an intracavity high harmonic source with a cutoff above 30 eV. The EUV source is based on a high power, hard-aperture, Kerr-lens mode-locked Ti:sapphire oscillator with a repetition rate of 9.4 MHz. The laser is operated in the net negative dispersion regime resulting in intracavity pulses as short as 17 fs with 1 µJ pulse energy. In a second intracavity focus, intensity more than 1014 W/cm2 has been achieved, which is sufficient for high harmonic generation in a Xenon gas jet. The project was supported by the DFG grant SE 1911/1-1, TMBWK B 715-08008, and the FSU grant “ProChance 2009 A1”. [1] Seres, E., Seres, J., Spielmann, Ch. (2012) “Extreme ultraviolet light source based on intracavity high harmonic generation in a mode locked Ti:sapphire oscillator with 9.4 MHz repetition rate” Opt. Express 10, 6185-6190. [2] Seres, E., Spielmann, Ch., (2010) “Development of an intracavity EUV Source based on a high-power Ti:sapphire oscillator”, Proc. SPIE, Vol. 7721 77210I (invited) [3] Seres, E., Spielmann, Ch., (2010) “High-power femtosecond oscillator generates extreme-UV Source“ SPIE Newsroom. DOI: 10.1117/2.1201003.002688

15:15

AMP T04

Comparison of multi-photon and EUV single-photon probing using a novel time-resolved EUV spectrometer Markus Koch, Jakob Grilj, Emily Sistrunk, Thomas J. A. Wolf and Markus Gühr TU Graz, Institute of Experimental Physics, Petersgasse 16, 8010 Graz Photoelectron spectroscopy is unique in mapping the valence electronic structure responsible for chemical bonding in molecules. High-order harmonic generation (HHG) provides photon energies that are high enough to access the whole set of valence electron levels in combination with the required time resolution. We present femtosecond pump-probe photoelectron and -ion spectra of perylene collected with a novel set-up. After excitation to the S1 state with 400 nm ionization is achieved either by a multi-photon transition with the 800 nm fundamental or with a single HHG photon. In the latter case we isolate the 9th harmonic (89 nm, 14 eV) using an In metal filter in combination with an Al mirror. In perylene molecules, we observe no indication for excited state dynamics with the 9th harmonic probe, while a strong signature of relaxation with a 1 ps time constant is obtained with 800 nm multi-photon probing. These contradicting results indicate the presence of resonant molecular states that interfere with the multi-photon probing scheme, which turns out to be more sensitive to relaxation dynamics. We use this setup for pump-probe studies in molecules with special attention to ultrafast non-radiative relaxation upon photo excitation. The high photon energy of the probe pulse allows us to follow the complete relaxation dynamics into the vibrationally hot ground state.

15:30

AMP T05

Systematic investigation of the absorption spectrum of La atoms using laser excitation and optogalvanic detection Tobias Binder and Laurentius Windholz Graz University of Technology, Institute for Experimental Physics, Petersgasse 16, 8010 Graz Using an Ar-La plasma, generated in a hollow cathode discharge as a source of free atoms, we performed laser-spectroscopic investigations between 560 and 610 nm. In our atom source, La atoms are present due to sputtering from the inner surface of the hollow cathode. The atoms take part in the discharge, thus absorption of laser light can be observed not only from ground or metastable states, but also from high lying energy levels (up to 30000 cm-1). We have scanned the laser wavelength (linewidth ca. 1 MHz or 10-6 nm) continuously over 50 nm and recorded an optogalvanic spectrum. We found in this range more than 1000 excited spectral lines, while in commonly used tables of spectral lines one finds less than 80. Most of the lines could be classified as transitions between already known La energy levels due to their wavelength and their hyperfine pattern. Of importance are the lines which could not be classified: when performing laser excitation and searching for laser-induced fluorescence lines, we were able to find a large number of up to now unknown energy levels, most of them having even parity. On the poster the way how these energy levels can be found is explained.

44

Zeit time

ID

15:45

AMP T06

AMP Chair: Markus Koch Attosecond spatial control of electron emission dynamics Li Zhang, Xinhua Xie, Stefan Roither, Daniil Kartashov, Yueming Zhou, Yanlan Wang, Chuanliang Wang, Markus Schöffler, Paul Corkum, Andrius Baltuska, Peixiang Lu, Igor Ivanov, Anatoli Kheifets, Xiaojun Liu, Andre Staudte and Markus Kitzler Vienna University of Technology, Photonics Institute, Gusshausstrasse 27/387, 1040 Wien Angström and attosecond control of free electron wave packets is one of the pinnacles of attosecond science. Orthogonally polarized two-color (OTC) laser fields allow to control the motion of field-ionizing electronic wave packets both in time and space [1]. In OTC pulses time and space are connected and thus an attosecond time scale is established in the polarization plane for both the emitted and the re-colliding wave packets [2]. We report on experiments that use OTC pulses for studying single and double ionization of neon using electron-ion coincidence momentum imaging. By exploiting the time-to-angle mapping inherent to OTC pulses [2] we gain experimental access to the dynamics of emitted and recolliding electron wave packets on laser-sub-cycle times from the momentum vector of emitted electrons. This allows us to study the influence of the parent ion's field on the trajectories of tunneling electrons during single ionization. In double ionization we show that by tuning the shape of the electric field of the OTC pulses on the sub-cycle scale it is possible to control the two-electron-emission dynamics in nonsequential double ionization, and to dictate whether the two electrons are predominantly emitted in a correlated or anticorrelated manner [3]. [1] M. Kitzler and M. Lezius, Phys. Rev. Lett. 95, 253001 (2005). [2] M. Kitzler, X. Xie, A. Scrinzi, and A. Baltuska, Phys. Rev. A 76, 011801 (2007). [3] L. Zhang, X. Xie, S. Roither, Y. Zhou, P. Lu, D. Kartashov, M. Schöffler, D. Shafir, P. B. Corkum, A. Baltuška, A. Staudte, and M. Kitzler, Phys. Rev. Lett. 112, 193002 (2014).

16:00

AMP T07

Electronic pre-determination of ethylene fragmentation dynamics Xinhua Xie, Erik Lötstedt, Stefan Roither, Markus Schöffler, Sonia Erattupuzha, Daniil Kartashov, Gerhard Paulus, Atsushi Iwasaki, Andrius Baltuska, Kaoru Yamanouchi and Markus Kitzler Vienna University of Technology, Photonics Institute, Gusshausstrasse 27/387, 1040 Wien Strong laser fields can be used to both initiate and drive electronic dynamics in a polyatomic molecule on their natural, i.e., sub-femtosecond, time-scale. This potentially opens up the feasibility of controlling molecular fragmentation processes by influencing the intra-molecular dynamics of the electron cloud with strong laser-electric fields. Indeed, it was shown that the outcome of fragmentation processes in polyatomic molecules can be affected by the shape of the laser electric field [1]. In general, the key to controlling fragmentation and accompanying isomerization processes in molecular ions is to prepare them in specific dissociative states from which the reaction proceeds through a desired fragmentation pathway on multi-dimensional potential energy surfaces towards a certain set of final fragment products, called a channel. This can be achieved either during the ionization process, but also by subsequent excitation processes during the interaction with the laser field. We report experiments on the polyatomic molecule ethylene dedicated to disentangling the contributions of the ionization step and the subsequent field-driven excitation dynamics to different fragmentation pathways from the doubly charged ion [2]. In particular, we show how these two excitation mechanisms that pre-determine the fragmentation reactions of the molecule, depend on laser pulse intensity and duration. We observe that the relative importance of contributions to the fragmentation probability of a given channel, either from the ionization step or from field-driven excitations, strongly depends on both laser intensity and pulse duration. Moreover, we show that not only the probability of a given channel, but even the specific pathways that can be taken along the multitude of dissociative electronic states towards this channel, are dependent on the laser pulse parameters. Thus, by properly choosing pulse intensity and duration it becomes possible to steer the molecular dynamics along a desired pathway in the phase-space spanned by the nuclear coordinates and momenta towards a certain set of final fragment ions. This opens up new possibilities for controlling the outcome of fragmentation reactions of polyatomic molecules in that it may allow to selectively enhance or suppress individual fragmentation channels, which was not possible in previous attempts of controlling the fragmentation behaviour of polyatomic molecules [1]. [1] X. Xie, K. Doblhoff-Dier, S. Roither, M. S. Schöffler, D. Kartashov, H. Xu, T. Rathje, G. G. Paulus, A. Baltuska, S. Gräfe, and M. Kitzler, Phys. Rev. Lett. 109, 243001 (2012). [2] X. Xie, S. Roither, M. Schöffler, E. Lötstedt, D. Kartashov, L. Zhang, G. G. Paulus, A. Iwasaki, A. Baltuska, K. Yamanouchi, and M. Kitzler, Phys. Rev. X 4, 021005 (2014).

45

16:15

AMP T08

Attosecond strong-field electron wavepacket interferometry Xinhua Xie, Stefan Roither, Daniil Kartashov, Diego Arbó, Stefanie Gräfe, Andrius Baltuska, Joachim Burgdörfer and Markus Kitzler Vienna University of Technology, Photonics Institute, Gusshausstrasse 27/387, 1040 Wien An important aim of Ultrafast Laser Science and Attosecond Physics is the measurement of valence electron dynamics in molecules during complex restructuring and fragmentation reactions. Such reactions may be triggered by the removal of electrons, e.g., by ionization with intense, ultrashort laser pulses. We demonstrate by experiments and simulations that detailed insight into the process of electron removal can be obtained from measurements that employ the interference of two bound state wavepackets released at different times within a sub-cycle of a laser field. We show that by exploiting this kind of electron wavepacket interferometry we can trace the evolution of the phase of the bound state of helium and neon atoms during the removal of an electron with sub-10 attosecond resolution [1]. Key to tracing the phase of the bound state as it undergoes dynamics on a sub-cycle timescale is the identification and extraction of a sub-cycle interferogram from threedimensional electron momentum spectra created by ionization of the system under study in an intense laser field. The extracted interferogram encodes the quantum phase difference of pairs of electron wavepackets that are timed to each other with attosecond precision. As a result, we are able to extract the sub-cycle phase-evolution of the laser-driven complex bound-state wavefunction during strong-field ionization. We find a strong deviation from the usually assumed linear rise which we attribute to a minute (<1%) but significant transient population of excited states. Thus, our experiment characterizes the formation of a bound electronic wavepacket as it occurs. Moreover, the measured interferogram allows us not only to reconstruct the phase-evolution of the bound state during strong-field ionization, but also gives access to the structure of the bound state. The sensitivity of the interferogram on both attosecond-scale dynamical and structural information will be most useful when applied to molecules and the investigation of multi-electron effects. [1] X. Xie, S. Roither, D. Kartashov, E. Persson, D. Arbó, L. Zhang, S. Gräfe, M. Schöffler, J. Burgdörfer, A. Baltuška, and M. Kitzler, Phys. Rev. Lett. 108, 193004 (2012).

16:30

Ende der Veranstaltung / End of session

17:00 18:30

Umtrunk und Ausstellungsbesuch ECHOPHYSICS

Öffentlicher Abendvortrag: Festsaal Schloss Pöllau 19:00 20:00

Univ.-Prof. Dr. Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald A T01

Die Energiewende Deutschlands – wohin wird sie führen?

46

Öffentliche Abendvorträge Festsaal Schloss Pöllau Zeit time

ID

19:00 20:00

A T01

Öffentlicher Abendvortrag Mittwoch, 24.09.2014 Chair: NN Die Energiewende Deutschlands – wohin wird sie führen? Friedrich Wagner Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald, Wendelsteinstraße 1, 17491 Greifswald, Deutschland Die „Energiewende“ Deutschlands ist ein politisch und gesellschaftlich gewollter Technologiewechsel in der Erzeugung, Verteilung und Nutzung von Energie. Die neue Technologie für Stromerzeugung basiert vornehmlich auf Wind und Sonne mit Folgen, die nicht oder wenig in der öffentlichen Diskussion genannt werden. Es liegt in der Bringschuld der Forschung, sich um weitergehende Aufklärung zu bemühen. Deutschland verfügt nun in der Summe über etwa 70 GW an installierter Leistung für Strom aus Wind- und Photovoltaik (PV)*-Kraftwerken. Der Stromverbrauch in Deutschland schwankt zwischen 35 und 85 GW. Aus dem Betrieb dieser Anlagen hat sich eine gute Datenbasis ergeben, um von den derzeitigen Beiträgen der Erneuerbaren Energien (EE) auf die Merkmale einer 100% Versorgung schließen zu können. Grundlage für diese Extrapolation sind die Daten von 2012, die in guter zeitlicher Auflösung für Bedarf, onshore- und offshore Wind und die PV Einspeisung vorliegen. Für eine 100%-Versorgung wird die gesamte installierte Leistung berechnet. Dabei ergeben sich Perioden mit Überschuss und solche, in denen der Strombedarf nicht durch die EE-Installationen abgedeckt wird, also weiterhin thermische Kraftwerke – Kohle-, Gas- oder Kernkraftwerke – benötigt werden. Deren Kapazität wird ermittelt. Das Verhältnis von Wind zu PV Leistung ergibt sich aus der Forderung, die verbleibende Kapazität an thermischer Leistung zu minimieren. Die Betriebsbedingungen für die thermischen Kraftwerke ändern sich: derzeit werden sie von der Dynamik des Verbrauchs, in der Zukunft von der der prioritären Erzeugung durch EE bestimmt. Die äußeren Betriebsbedingungen für diese Kraftwerke werden analysiert. Sobald taugliche Speichertechniken entwickelt sind, kann der Überschuss in Speichern genutzt werden und damit die thermischen Kraftwerke ersetzen. Speicherumfang und –betrieb lassen sich definieren und charakterisieren. Es wird generell erwartet, dass in einem gewissen Maß Lastanpassung erfolgt, dass also über den Strompreis die Nachfrage an die Verfügbarkeit angepasst wird. Die Randbedingungen dafür werden aufgezeigt. Letztlich wird die CO2-Produktion bei der Stromversorgung, die ja ein wesentliches Motiv für die „Energiewende“ ist, analysiert und mit der anderer Länder verglichen. Das Problem einer Versorgung mit Wind und Sonne ist die erratische Natur der Produktion. Schwankungen können zum Teil ausgemittelt werden über die Stromeinspeisung in ein europäisches Gesamtnetz aus Regionen mit unterschiedlichen Wetterbedingungen. Inwieweit sich damit die wesentlichen Charakteristiken einer Stromversorgung vornehmlich aus Wind und Sonne einfacher gestalten lassen, wird im Vortrag gezeigt. * In PV Anlagen wird das Sonnenlicht direkt über den sog. Photoeffekt in Strom umgewandelt.

47

Öffentlicher Abendvortrag Donnerstag, 25.09.2014 Chair: NN 19:30 20:30

A T02

Quantenphysik und Information Anton Zeilinger Österreichische Akademie der Wissenschaften & Universität Wien, Boltzmanngasse 5, 1090 Vienna Information entwickelt sich immer mehr zu einem zentralen Konzept in den modernen Interpretationen der Quantenphysik. Interessant ist die Bedeutung der Information in verschiedenen fundamentalen Experimenten, beginnend vom Doppelspalt über den Quantenradierer bis zu verschränkten Photonen. In jüngster Zeit hat das Konzept der Information zu einer neuen Methode der Abbildung geführt, bei der die mit dem Objekt wechselwirkenden Photonen überhaupt nicht nachgewiesen werden müssen.

Öffentlicher Abendvortrag Freitag, 26.09.2014 Chair: NN 19:30 20:30

A T03

Evolution gesehen durch die Brillen der Physiker und der Biologen Peter Schuster Universität Wien & Österr. Akademie der Wissenschaften, Dr. Ignaz Seipel Platz 2, 1010 Wien Die Entwicklung der Naturwissenschaften wurde Jahrhunderte lang durch die Physik und ihr Verhältnis zur Mathematik bestimmt. In gleicher Weise kann man zu Recht behaupten, dass die heutige Mathematik ohne Physik nicht das wäre, was sie ist. Völlig anders ist die gegenseitige Beziehung zwischen der erst etwa zweihundert Jahre alten Biologie zur Mathematik: Die konventionelle Theorie der Evolution wurde weitestgehend ohne eine einzige mathematische Formel entwickelt, obwohl sie auch schon zu Zeiten Darwins unschwer quantitativ formulierbar gewesen wäre. Physiker lieben allgemeine Konzepte, die in eine exakte Form gegossen werden können, wogegen konventionelle Biologen Details und Sammlungen hübscher Ausnahmen bevorzugen. Mit der Molekularbiologie nahmen Chemie, Physik und in ihrem Tross auch die Mathematik Einzug in die Biologie und auch in die Evolutionsforschung. Die heutigen Forschungs- und Analysetechniken stehen ohne massive Unterstützung durch Informatik und Mathematik auf verlorenem Posten. Im Referat wird eine mathematisierbare und mathematisierte Evolutionstheorie vorgestellt, die in ihrer Anwendung auf einfache Systeme präzise überprüfbare quantitative Aussagen machen kann. Insbesondere gelang durch die Konzeption von zellfreien, zur Evolution befähigten Experimentalsystemen der Brückenschlag zwischen chemischer Kinetik und Biologie. Die in den letzten dreißig Jahren entdeckten neuen Regulationsmechanismen der Zellentwicklung und Vererbung können nur durch quantitative Modelle auf molekularer Basis verstanden werden. Ohne quantitative Konzepte und ausgefeilte computertechnische Methoden ist die heutige Datenflut in der Biologie nicht beherrschbar.

48

Plenarsitzung / Plenary session Donnerstag/Thursday, 25.09.2014, 9-18, Festsaal Schloss Pöllau

Zeit time

ID

09:00

PLE T01

Plenarvortrag OGD Chair: Ulrike Diepold The small frontier: Imaging molecular functionality Klaus Kern MPI für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Deutschland The advent of scanning probe microscopy has provided the unique ability to investigate matter with ultimate precision. Single atoms and molecules can today be imaged with unprecedented resolution and also probed by local spectroscopy, manipulated to assemble functional nanostructures and excited to induce electronic and chemical change. In the present talk I will present our recent efforts to push the limit of scanning probe microscopy and spectroscopy by exploiting ultralow temperatures (10mK) as well as by developing novel vacuum interfaces for the controlled handling of large molecules with negligible vapor pressure. The experiments provide unprecedented microscopic details of single molecule junctions and electrodynamics, quantum magnetism, and protein folding. Many new perspectives ranging from quantum critical phenomena through molecular engineering to energy conversion are opened up by these developments.

Plenarvortrag FKP Chair: NN

ID

09:45

PLE T02

Hunds-rule coupling and magnetism in technetium and chromium oxides Markus Aichhorn TU Graz, Institute of Solid State Physics, Petersgasse 16, 8010 Graz Strong magnetism is in general only expected in 3d transition metal compounds based on iron, nickel or cobalt. Therefore it was quite surprising to find robust magnetism in the 4d compound SrTcO3. We will present a DFT+DMFT analysis of the electronic and magnetic properties of this compound, showing that it is located right at the metal-to-insulator transition, due to strong Hunds coupling. We will also show that magnetism is strongest at this transition point, explaining the high Neel temperature of this compound. Similarily, I will discuss recent findings on the chromium compound BaCrO3, revealing insulating behaviour over a large temperature range. We will show that the interplay between correlations, magnetism, and lattice degrees of freedom are important to explain this insulating state.

10:30 10:59 11:00 12:14

Kaffeepause / Coffee break Ehrungen Fritz Kohlrausch-Preis Max Auwärter-Preis Victor Franz Hess-Preis Anton Paar-Preis Preise für Fachbereichsarbeiten Team Internationale Physikolympiade Team International Young Physicists´ Tournament (IYPT)

49

ID

12:15

PLE T03

Plenarvortrag FAKT Chair: NN The PANDA experiment at FAIR Paul Bühler Stefan-Meyer-Institut für subatomare Physik der ÖAW, Boltzmanngasse 3, 1090 Wien FAIR, Facility for Antiproton and Ion Research is a new international accelerator facility for the research in the domain of subatomic physics with antiprotons and ions. It is built in cooperation of an international community of countries. FAIR is located in Darmstadt, Germany and is planed to go into operation towards the end of this decade. The main thrust of FAIR research focuses on the structure and evolution of matter on both a microscopic and on a cosmic scale. PANDA (antiProton Annihilation at Darmstadt) is one of the key experiments which will be operated at FAIR. PANDA consists of a versatile detector which is able to provide precise energy and momentum measurements and efficient identification of charged particles. The combination of the PANDA detector with the antiproton accelerator at FAIR is internationally unique and promises to bring new fundamental knowledge in Hadron Physics. In this presentation an overview of the PANDA experiment and its physics program will be given.

13:00 14:29

Mittagspause / Lunch break

14:30 15:30

ÖPG-Jahreshauptversammlung

15:30 15:59

Kaffeepause / Coffee break ID

16:00

PR T01

Preisträgervortrag Fritz Kohlrausch-Preis Chair: NN Water’ s second glass transition Katrin Amann-Winkel University of Innsbruck, Institute of Physical Chemistry, 6020 Innsbruck An understanding of the numerous anomalies of water is closely linked to an understanding of the phase diagram of the metastable non-crystalline states of ice. The discovery of high(HDA) and low-density amorphous ice (LDA) [1] prompted the question whether this phenomenon of polyamorphism is connected to the occurrence of more than one supercooled liquid phase. In case of LDA the connection to the low-density liquid (LDL) was inferred from several experiments including the observation of a calorimetric glass-to-liquid transition at 136 K [2]. However, in case of HDA instead no calorimetric signature has been detected so far. Experiments using differential scanning calorimetry (DSC) and dielectric spectroscopy show for the first time that HDA transforms into a liquid upon heating at ambient pressure [3]. The glass-to-liquid transition upon heating is evidenced by an endothermic step, which indicates that the liquid has a higher heat capacity than the glass due to an increase of molecular mobility, e.g., by unfreezing of translational motion. In our measurements the corresponding calorimetric signature occurs at 116 K. This glass transition can also be detected by dielectric spectroscopy via the appearance of an absorption peak centred at about 10–2 Hz. From the temperature dependent peak positions a relaxation map can be constructed. The good agreement between dielectric and calorimetric results convey for a clearer picture of water's vitrification phenomenon. [1] O. Mishima, L. D. Calvert, E. Whalley, Nature 314, 76 (1985) [2] G.P. Johari, A. Hallbrucker, E. Mayer, Nature 330, 552 (1987) [3] K. Amann-Winkel et al., PNAS 110, 17720 (2013)

50

ID

16:30

PR T02

Preisträgervortrag Max Auwärter-Preis Chair: NN From ultrathin perovskites to oxide quasicrystals Stefan Förster Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany By reducing their dimensionality solid materials can exhibit a variety of properties which are unknown for the related three-dimensional systems. This is not only valid for graphene, but also for ultrathin films of almost any material. With decreasing film thickness the materials properties are more and more governed by the interfaces to the substrate support and to the vacuum induced by structural changes. From controlling the growth environment and by this also the structure of ultrathin films eventually also the engineering of new properties might become possible. Here it is demonstrated how by choosing the right growth conditions and substrate orientations long-range ordered epitaxial thin films of the prototypical perovskite oxide BaTiO3 can be grown with either (100) or (111) orientation. Additionally, at certain conditions even the creation of an aperiodic structure at the interface to the substrate support can be induced: Upon annealing at 1250 K in ultrahigh vacuum the spreading of a two-dimensional quasicrystal across the Pt(111) surface has been observed [1]. In lowenergy electron diffraction measurements the quasicrystalline structure shows bright and sharp spots with dodecagonal symmetry. Atomically-resolved scanning tunneling microscopy images reveal that the surface atoms are arranged in quadratic, triangular, and rhombic building blocks. They form dodecagonal arrangements which are similarly observed in the prototypical aperiodic Gähler tiling. In addition to this dodecagonal atomic arrangement, the same structural building blocks are found on (2+√3) and (2+√3)² larger scales indicating the characteristic self-similarity of a well-ordered quasicrystal. A pronounced long-range order of the system is also revealed by the existence of phasons. These lattice excitations are exclusively found in quasicrystals and have been observed in real space as well as in reciprocal space. The interface-driven formation of a two-dimensional quasicrystal from a perovskite oxide as reported here potentially extends the quasicrystal concept to a broader range of materials. [1] S. Förster, K. Meinel, R. Hammer, M. Trautmann, and W. Widdra, Nature 502, 215 (2013)

ID

17:00

PR T03

Preisträgervortrag Victor Franz Hess-Preis Chair: NN Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3 Susanne Friedreich ETH Zurich, Institute for Particle Physics, Otto-Stern-Weg 5 (HPK F 30), 8093 Zurich, Switzerland Antiprotonic helium-3 is a neutral exotic atom, consisting of a helium nucleus, an electron and an antiproton. The interactions of the angular momenta of its constituents cause a hyperfine splitting within the energy states. Three percent of the formed antiprotonic helium atoms remain in a metastable, radiative decay-dominated state with a lifetime of a few microseconds. This time window is used to do spectroscopic studies. The hyperfine structure of antiprotonic helium-4 was already extensively investigated before. From these measurements the spin magnetic moment of the antiproton was determined precisely. A comparison of the result to the proton magnetic moment provides a test of CPT invariance. Due to its higher complexity the measurement with antiprotonic helium-3 provides a cross-check and a more stringent test of theoretical calculations. Two out of four measurable transition lines of the (n,L)=(36,34) state of antiprotonic helium-3 were observed for the first time and in good agreement with theoretical calculations.

51

17:30

PLE T04

Projekt: „Coole Physik“ Erich Gornik, Christian Fabjan, Walter Kutschera, Leo Ludick und Leopold Mathelitsch Technische Universität Wien, Wiedner Hauptstrasse 8, 1040 Wien „Coole Physik“ ist ein von der ÖPG unterstütztes Projekt mit dem Ziel, attraktive Dokumentationen für den Physik-Unterricht, Schwerpunkt Physik des 20. und 21. Jahrhunderts, bereitzustellen. Die Thematik wird in „Module“ gegliedert, welche als Unterstützung für jeweils ein bis einige Unterrichtseinheiten verwendet werden können. Die Module werden in Zusammenarbeit von Lehrern und Lehrerinnen, Didaktikern und Didaktikerinnen mit Experten und Expertinnen ausgearbeitet. Jedes Modul umfasst drei Stufen: Unterstufe Schüler, Unterstufe Lehrer, Oberstufe (bis zu Physikspezialisierung mit Ausarbeitung von Fragen, Projekten). Als Plattform wird die e-learning Oberfläche „MOODLE“ verwendet. Dadurch soll erreicht werden, dem Unterricht neue Impulse unter Verwendung elektronischer Medien zu geben: interaktives, partizipierendes Lehren und Lernen; Links zu Simulationen und Experimenten, Diskussionsforen. Einige Beispiele werden gezeigt.

18:00 19:30

Posterpräsentationen, Schloss Pöllau

19:30 20:30

Öffentlicher Abendvortrag, Festsaal Schloss Pöllau

COND, FAKT, Astro/ExoLife

Univ.-Prof. Dr. Anton Zeilinger Universität Wien & Österreichische Akademie der Wissenschaften, Wien A T02

Quantenphysik und Information Information entwickelt sich immer mehr zu einem zentralen Konzept in den modernen Interpretationen der Quantenphysik. Interessant ist die Bedeutung der Information in verschiedenen fundamentalen Experimenten, beginnend vom Doppelspalt über den Quantenradierer bis zu verschränkten Photonen. In jüngster Zeit hat das Konzept der Information zu einer neuen Methode der Abbildung geführt, bei der die mit dem Objekt wechselwirkenden Photonen überhaupt nicht nachgewiesen werden müssen.

52

LHS Donnerstag/Thursday, 25.09.2014, 14-17:50, Refektorium

Zeit time

ID

14:00

LHS T01

Physik und Schule Chair: NN „Verborgene Schätze“: historische physikalische Geräte in Physik-Kabinetten Armin Denoth University Innsbruck, Technikerstrasse 25, 6020 Innsbruck Neue physikalische Erkenntnisse und neue physikalisch-technische Entwicklungen finden heute unter dem Titel ‚moderne Physik’ Eingang in den Unterricht. Das schlägt sich natürlich auch in der Anschaffung von neuen Lehrmitteln und Demonstrationsgeräten nieder. Als Folge davon – bei fast schon naturgemäß beengten Platzverhältnissen – müssen die ‚alten’ Lehrmittel weichen: - Viele der alten Lehrmittel wurden und werden immer noch – zum Teil auch wegen mangelnder Funktion – entsorgt: eine Internet-Suche nach 'historischen physikalischen Apparaten' im Bereich 'Universitäts- und Schulsammlungen' zeigt leider allzuoft den Eintrag: 'Verbleib unbekannt' oder 'Sammlung aufgelöst' (z.B. http://www.universitaetssammlungen.de/search/obgforschung/Physik) - einige wurden als Ersatzteilspender verwendet, bis der ursprüngliche Zweck verloren ging - einige tauchen bei Auktionsbörsen und Versteigerungen wieder auf: so entpuppte sich u.a. ein als 'Tauchsieder' angebotenes Gerät als ein „Chromsäure-Tauchelement nach Bunsen“, und eine „Vakuumskala nach Cross“ war als 'Alte Röhren Versuchsmodell' bezeichnet. - aber einige 'alte' Geräte belegen noch 'stille Ecken' in den entsprechenden Kabinetten und bilden den 'historischen Teil' der Lehrmittelsammlung. Anlass genug, einmal diesen 'historischen Teil' in physikalischen Lehrmittelsammlungen zu erfassen und zu dokumentieren: und es kamen wahre 'Schätze' zum Vorschein! Einige Geräte-Schätze aus Physik-Kabinetten einiger AHS aus dem Bezirk 'Innsbruck' und auch aus der Lehrmittel-Sammlung des Institutes für Experimentalphysik der Universität Innsbruck werden vorgestellt.

14:20

LHS T02

Rundblick über physikalische Kulturgüter in Sammlungen an alten Höheren Schulen Österreichs Leopold Stadler 1090 Wien Ursprünglicher Bestand – extrem geschrumpft – Beispiele und Gründe für Gefährdung und Vernichtung an Schulen (u.a. Verwaltungsvorschriften, Unverstand, Raumnot, Geldbeschaffung,...) u. u.: welche günstige Umstände Wertvolles zu erhalten vermochten. Vorschläge zur Sicherung des noch vorhandenen Bestandes kulturhistorisch wertvoller Physikgeräte an Schulen. Beschreibung einer positiven Ausnahme aus dem Berufsleben des Referenten (Entstehungsgeschichte, abgewehrte Vernichtungsversuche, etwa 250 alte Geräte decken alle Themen ab, welche vor über 100 Jahren im P-Unterricht behandelt wurden). Zuletzt die spannende Chronologie des Versuchs, durch Einbinden des BDA/Abteilung für technische Denkmale eine gesicherte Zukunft dieses physikalischen Ensembles zu bewirken. Zu allen Punkten werden konkrete Beispiele und Bilder beigestellt.

53

14:40

LHS T03

Projekt: „Coole Physik“ Leopold Mathelitsch, Christian Fabjan, Erich Gornik, Walter Kutschera und Leo Ludick Universität Graz, Universitätsplatz 5, 8010 Graz „Coole Physik“ ist ein von der ÖPG unterstütztes Projekt mit dem Ziel, attraktive Dokumentationen für den Physik-Unterricht, Schwerpunkt Physik des 20. und 21. Jahrhunderts, bereitzustellen. Die Thematik wird in „Module“ gegliedert, welche als Unterstützung für jeweils ein bis einige Unterrichtseinheiten verwendet werden können. Die Module werden in Zusammenarbeit von Lehrern und Lehrerinnen, Didaktikern und Didaktikerinnen mit Experten und Expertinnen ausgearbeitet. Jedes Modul umfasst drei Stufen: Unterstufe Schüler, Unterstufe Lehrer, Oberstufe (bis zu Physikspezialisierung mit Ausarbeitung von Fragen, Projekten). Als Plattform wird die e-learning Oberfläche „MOODLE“ verwendet. Dadurch soll erreicht werden, dem Unterricht neue Impulse unter Verwendung elektronischer Medien zu geben: interaktives, partizipierendes Lehren und Lernen; Links zu Simulationen und Experimenten, Diskussionsforen. Einige Beispiele werden gezeigt.

15:00

LHS 11

Interferometrie von Materiewellen Julia Salapa Akademisches Gymnasium Wien (Betreuung: Dr. Erwin Kronberger)

15:15

LHS 12

Die Automatisierung einer Carrera-Rennbahn Michael Fellner BRG Wörgl (Betreuung: Mag. Christian Pronegg)

15:30 15:59 16:00

Kaffeepause / Coffee break LHS 13

Von Lasern und Legierungen Philipp Haim BRG Wels (Betreuung: Mag. Petra Kragl)

16:15

LHS 14

Die Möglichkeiten des 3D-Drucks mit dem Verfahren des Fused Deposition Modeling anhand des RepRap Prusa Mendel I2 Benjamin von Berg Keplergymnasium Graz (Betreuung: Dr. Leander Brandl)

54

16:30

LHS T04

From “The Big Bang Theory” to Young High-Potentials education in physics Johannes Leitner, Ruth-Sophie Taubner, Maria Firneis and Regina Hitzenberger University of Vienna, Research Platform: ExoLife, Türkenschanzstraße 17, 1180 Vienna Presently, the US comedy sitcom “The Big Bang Theory” is one of the most famous TV serials all over the world. It follows the work and life of three physicists, one engineer and their friends. Various scientific topics related to astrophysics, space, and experimental physics and principal basic questions of natural sciences are addressed. Many youngsters watch this TV show and discuss the topics in their private surroundings. It is reported that the success of the serial is also responsible for an increasing interest in natural sciences, and especially in physics. For example, there was an increase of 17 % of University students in physics in 2010 and furthermore a strong increase of applicants for courses on physics in High Schools in the UK, too [3]. In our classical courses and lectures for young high-potentials and any other young interested parties we have observed the same phenomenon. Various students from 9-14 years are highly interested in the physical questions raised in this TV show. In order to follow this trend we have developed special programs for high-potentials. We will present programmatic insights into our program/high-potential course on “From The Big Bang Theory to Natural Sciences”. Therein, selected astronomical, astrobiological and planetary science questions, which have arisen in the TV show are taken up as issues and discussed with the youngsters in the course. Thereby, both theoretical and experimental approaches are used to ensure an optimal learning-and-teaching-environment. [1] Leitner, J.J., Firneis, M.G.: Lehrmeister Weltall – Astrobiologie als interdisziplinärer Zugang zur Naturwissenschaft. In: Brugger, E., Gornik, E., Neichl, B., Tomaschek, N. (eds) University Meets Public – Nachlese, Ausgewählte Beiträge zum Thema „Lernende Gesellschaft“, Verlag Edition Volkshochschule, Vienna, p. 70-81, 2011. [2] Leitner, J.J., Firneis, M.G., Hitzenberger, R.: Astrobiology as a starting point for natural sciences for school and university students – Initiatives in Austria. European Astrobiology Network Association (EANA) Meeting, July 22-25, 2013, held in Szczecin, Poland, 2013. [3] Townsend, M.: Big Bang Theory fuels physics boom. The Observer: November 6, 2011, online available under: http://www.theguardian.com/education/2011/nov/06/big-bangtheory-physics-boom.

16:50

Physik-Olympiade

17:05

International Young Physicists´ Tournament

17:20 17:50

Geschäftssitzung des Fachbereichs (Neuwahl der Vorsitzenden)

55

56

CiP Donnerstag/Thursday, 25.09.2014, 16-17:20, Festsaal Raika Zeit time

ID

16:00

CIP T01

CIP Chair: Doris Steinmüller-Nethl Bachelor, Master oder Dissertation – und was nachher? Elisabeth Schwab and Josef Siess Euspug, Paulanergasse 15/2, 1040 Vienna Nicht alle Physiker und Physikerinnen können nach ihren Abschluss an der Universität bleiben oder in einen anderem Forschungszentrum Fuß fassen. Wie kann ein Wechsel in die Industrie oder in andere Sektoren gelingen, wenn man vorher noch keinen Kontakt dorthin hatte? Was kann einem helfen, sich darauf vorzubereiten? Welche Überlegungen kann man anstellen, um sich zu einem Schritt ins Ausland (oder dagegen) zu entscheiden? Beispiele aus der Erfahrung von Physikern und Physikerinnen geben Einblicke in außeruniversitäre Arbeits-und Lebensbereiche, aus denen man sich Nützliches nehmen kann.

16:20

CIP T02

Am Anfang war alles leicht Richard Zemann TU Wien, Adolf Blamauergasse 1-3, 1030 Wien Die Naturwissenschaften, aber vor Allem die Physik, sind elementare Bestandteile unserer aktuellen Zeit. Unser modernes, mitteleuropäisches Weltbild, das im hohen Maße durch Industrialisierung und Wohlstand geprägt wird, basiert auf Wissen um und Verständnis für physikalische Vorgänge. Aus diesem Grund sollte diese Wissenschaft vermarktet und gefördert werden. Nur mit der stetigen Weiterentwicklung von beispielsweise physikalischtechnischen Möglichkeiten wie Fertigungsverfahren für die Sachgüterproduktion, kann die mitteleuropäische Lebensweise langfristig abgesichert werden. In dem Vortrag soll die Laufbahn des jungen Forschers, Richard Zemann, im Bereich Maschinenbau an der Technischen Universität Wien präsentiert werden. Neben der Darstellung der Herausforderungen im Leben nach dem Studium, soll angesprochen werden, dass in praktisch jedem Bereich der Technik physikalisches Wissen und Verständnis notwendig sind, um erfolgreich arbeiten zu können. Als Beispiel der stetig hohen Relevanz der Physik sollen die Herausforderungen im Leichtbau mit Faser-Kunststoff-Verbunden vorgestellt werden. Eine der aktuell größten Hürden ist die Endbearbeitung von Faserverbundbauteilen. Zur Behandlung dieses Themenkomplexes wurde am Institut für Fertigungstechnik und Hochleistungslasertechnik der TU Wien die Initiative FIBRECUT gestartet. In der Arbeitsgruppe rund um Richard Zemann versucht man demzufolge einige der unbeantworteten Fragestellungen durch neue Ansätze und Verfahren zu lösen.

57

16:40

CIP T03

Mut zur Selbstständigkeit – realistisch oder blauäugig? Doris Steinmüller-Nethl CarbonCompetence GmbH, Aste 41, 6074 Aldrans Das Physikstudium bietet durch seine Breite und analytische Herangehensweise bei Problemlösungen eine hervorragende Voraussetzung, selbstbestimmt zu arbeiten. Gerade in der heutigen Zeit sind Innovationen und Entwicklungen für europäische Unternehmen von großer Bedeutung, doch blockieren oftmals starre Strukturen und lange Entscheidungswege, notwendige Schritte zu gehen oder neue Forschungsprojekte zu initiieren. PhysikerInnen hingegen haben oft brillante oder kreative Ideen, die für viele Unternehmen von großer Bedeutung wären. Daher ist der Weg über die Selbstständigkeit eine echte Alternative, um in eigenen Netzwerken und Forschungsprojekten diese Ideen für neue Produkte zu realisieren – und man muss dafür nicht männlich oder ein Genie sein – das Potenzial zum Unternehmer steckt in jedem von uns und ist kein Ausnahmephänomen. Die einzig richtige Geschäftsidee entsteht aber nicht spontan unter der Dusche, sondern es entwickelt sich durch unternehmerische Tätigkeit gleich eine Vielzahl an Möglichkeiten. Daher sollte man nicht auf die „Richtige“ warten, sondern „ins Tun kommen” und den Schritt in die Selbstständigkeit wagen. Unternehmer sind keine „Propheten“ – wir müssen die Zukunft nicht vorhersehen, aber wir können sie gestalten, nach eigenen Wertevorstellungen, in eigener Verantwortung! Auch das Scheitern muss erlaubt sein – Neustart mit Erfahrungen bringt oft erst beim zweiten oder dritten Versuch den Erfolg. Frau Dr. Steinmüller-Nethl, die als Physikerin bereits 1994 den Schritt in die Selbstständigkeit wagte, wird über Ihre Erfahrungen, Hürden, Erfolge, Scheitern und Neuanfang berichten und einen Einblick in eine interessante Berufswelt geben.

17:00

CIP T04

On-boarding: Worauf neue Mitarbeiter im Unternehmen achten [soll(t)en] Josef Siess and Elisabeth Schwab EUSPUG, Paulanergasse 15, 1040 Wien Die ersten 100 Tage eines neuen Mitarbeiters entscheiden maßgebend über den Erfolg und nachhaltigen Verbleib des neuen Mitarbeiters im Unternehmen. Wie soll der neue Mitarbeiter eingearbeitet werden? Was braucht es um rasch das Aufgabengebiet/Stellenbeschreibung erfüllen zu können? Was darf / soll der neue Mitarbeiter an Mindestanforderung erwarten? Beispiele sollen zeigen wie es für alle Beteiligten effizienter und effektiver mit Spaß und Freude möglich ist.

17:20

Ende der Veranstaltung / End of session

58

Astro/ExoLife Poster Donnerstag/Thursday, 25.09.2014, Schloss Pöllau, 18:00-19:30

ID

EXOL P01

Astro/ExoLife Poster Chair: NN Including new Cassini’s Gravity Measurements into Interior Structure Models of Enceladus Ruth-Sophie Taubner, Johannes Leitner, Maria Firneis and Regina Hitzenberger University of Vienna, Research Platform: ExoLife, Türkenschanzstrasse 17, 1180 Vienna At the beginning of this year, Iess et al. finally published first results of the Enceladus’ gravity measurements made by Cassini during the three close flybys E9, E12, and E19. The authors reported the values for the largest quadrupole harmonic coefficients and their ratio, which leads to a moment of inertia of around 0.335 MR2 (Iess et al., 2014). These results reinforce the hypothesis that Enceladus possesses a local subsurface water aquifer beneath the South Polar Terrain. We will present estimations about the dimensions of the liquid water reservoir and about the physical parameters at the rocky core/water boundary. The results of our study will give us a first idea of the physical and chemical conditions in this potential habitat to assess if this region may be suitable to harbor life-as-we-know-it.

EXOL P02

Hotspots and the Heat Budget of Venus Elisabeth Fahrngruber, Johannes Leitner and Maria Firneis University of Vienna, Research Platform: ExoLife, Türkenschanzstrasse 17, 1180 Vienna Venus is said to be the sister planet of Earth due to similarities in size, gravity, and bulk composition. However, striking differences such as the lack of water as well as the absence of plate tectonics create an environment vastly different from the one on Earth. Therefore, although it is known how Earth controls its heat budget, similar conclusions cannot be drawn for that of Venus. A common occurrence, hotspots, the surface expression of mantle plumes, only play a minor role in Earth’s heat budget. On Venus, however, they may be of more importance. Nine Venusian hotspot regions are analyzed based on certain similarities which they share with terrestrial counterparts: the topographic rise, also called hotspot swell, and the high heat flow. The latter, however, has not been measured yet and had to be approximated mathematically for an appropriate model. These calculations yield the magmatic output from which conclusions can be drawn for the role of hotspots on Venus’s heat budget and the so called resurfacing event.

EXOL P03

Possible Water Flow Interaction of Rivers, Lakes and Oceans on Mars Gabor-Imre Kiss, Johannes Leitner and Maria Firneis University of Vienna, Research Platform: ExoLife, Türkenschanzstrasse 17, 1180 Vienna We modelled scenarios of water flow of rivers and groundwater interaction with nearby lakes on planet Mars. Recent observations of the Curiosity mission have shown evidence of river flows lasting for several hundred to some thousands of years [1]. McKay et al. [2] have shown that ice-lakes could sustain a liquid reservoir for up to 700 million years if fed by meltwater. Several observations indicate periods of water exchange between rivers and lakes. Burr et al. [3] calculated a maximum flow for outflow channels under Hesperian conditions, i.e. low atmospheric pressure and temperature. Lake beds providing the ingredients of life [1, 4] as we know it depend on freshwater flux. We used a groundwater flow model called MODFLOW [5] to investigate the possible effects of water interaction at proposed Martian shorelines. [1] Grotzinger et al., "A Habitable Fluvio-Lacustrine Environment at Yellowknife Bay, Gale Crater, Mars", Science 343, (2014); [2] McKay, et al., "Duration of Liquid Water Habitats on Early Mars", ICARUS 90, 214–221 (1991) [3] Burr et al., "Megaflooding on Earth and Mars", Cambridge University Press, New York, 2009 [4] Ming et al, "Volatile and Organic Compositions of Sedimentary Rocks in Yellowknife Bay, Gale Crater, Mars", Science 343, (2014); [5] Carr et al., "Oceans on Mars: An assessment of the observational evidence and possible fate", Journal of Geophysical Research (Planets), Volume 108, Issue E5, pp. 8-1, 2003

59

EXOL P04

Estimating the Relative Age of Polygonal Impact Craters on Venus Gerhard Weihs, Johannes Leitner and Maria Firneis University of Vienna, Research Platform: ExoLife, Türkenschanzstrasse 17, 1180 Vienna On the inner planets of our Solar System impact craters are characteristic landforms, and from their number, distribution and conservation status the geological history of the planet can be derived. Polygonal impact craters (PICs) are characterized by a more or less rectangular shape and by the criterion that the crater rims are forming at least two adjacent straight segments. Previous studies have proven that these polygonal impact craters on the Moon, on the planets Mercury, Venus, Earth and Mars, as well as on some icy moons and asteroids do exist. The aim of this study was to estimate the relative age (the age of the craters in relation to the surrounding geologic structures, e.g. plains, tesserae, etc.) of polygonal impact craters on the surface of Venus. For example, from the fact that a crater superimposes a regional plain we can derive that the crater is younger than the plain. From a list of 121 identified polygonal impact craters, we selected 22 with a diameter of more than 30 km. The limitation of the radii was necessary because smaller diameters often yield ambiguous results. The dense atmosphere of Venus prevents the smallest projectiles from cratering the surface, usually by breaking them into smaller fragments or by eroding them. As a reference for the age determination we chose regional plains with wrinkle ridges. The temporal degradation of radar-dark halos near the PICs was used as a second method of investigation. From the results of the analyses we were able to limit the scope for the relative age of polygonal impact craters on Venus to 235 ± 70 million years.

60

Pöllauer Tage der Physikgeschichte „Und dennoch bewegen sie sich …“ – BoltzmannTagung Freitag/Friday, 26.09.2014, 9-17:30, Refektorium Schloss Pöllau

Zeit time

ID

09:00

B T01

Boltzmann-Tagung Chair: Peter Maria Schuster Maxwell’s Dämon: Seine Historie und Entzauberung im Wechselspiel von Thermodynamik und Informationswissenschaften Heinz Krenn Universität Graz, Institut für Physik, Universitätsplatz 5, 8010 Graz Als William Thomson (der spätere Lord Kelvin) Maxwells fiktives „intelligentes Wesen“ (1871), das den zweiten Hauptsatz der Wärmelehre verletzen könnte, dämonisierte, war eine dauerhafte Kontroverse über die Existenz dieses Dämons losgetreten worden, die seither führende Physiker (Loschmidt, Boltzmann, Einstein, Smoluchowki, Szilard, Brillouin, Gábor, Landauer, Bennett) über eineinhalb Jahrhunderte beschäftigen. Beginnend mit dem „Irreversibiltätsparadoxon“ und eine mögliche mechanistische Interpretation des 2. Hauptsatzes, gewann schließlich die statistische Interpretation die Oberhand. Für Einzelmolekül-Dämonen (Szilard, 1929) wurden Begriffe wie „Information“ und „Intelligenz“ eingeführt. Die Informationswissenschaften (Shannon, 1949) lieferten ein Maß für den Wissensinhalt eines Rechenprozesses, das als „Negentropie“ (Brillouin, 1957) definiert wurde. Somit war eine Brücke geschlagen zwischen Thermodynamik und Informationswissenschaften, die häufig bezweifelt wurde (sind Rechenprozesse reversibel und vernichten Sie als dissipative Prozesse unwiederbringlich Energie?). Derartige Fragen wurden von Landauer (1961) und Bennett (1982) mit Hilfe des „Löschprinzips“ der im Gedächtnis des Dämons gespeicherten Information beantwortet, womit er entzaubert werden konnte. Ob das Löschen eines Bits mit einer „echten“ Energieabgabe von kTln2 an die Umgebung verbunden ist oder diese Informationsenergie etwa durch thermische Fluktuationen des elektronischen Lösch- und Kontrollprozesses unmessbar gemacht wird, ist Gegenstand jüngster Experimente, die beweisen sollen, dass der 2. Hauptsatz nicht ausgehebelt werden kann.

09:45

B T02

Irreversibilität: von der Boltzmanngleichung zu den Fluktuationstheoremen Christoph Dellago University of Vienna, Boltzmanngasse 5, 1090 Vienna In der Natur beobachten wir oft Vorgänge, die spontan nur in einer Richtung ablaufen, niemals jedoch in die entgegengesetzte. Wie sich solch irreversibles Verhalten aus der mikroskopisch reversiblen Dynamik klassischer Vielteilchensysteme ergibt, ist ein Thema, welches in Boltzmanns Werk eine zentrale Stellung einnimmt. Mit der nach ihm benannten Gleichung und der statistischen Interpretation der Entropie hat Boltzmann den Grundstein für unser Verständnis irreversibler Prozess gelegt. In meinem Vortrag werde ich zunächst einen Überblick über Boltzmanns Behandlung der Irreversibilität geben. Darauf aufbauend werde ich neuere Entwicklungen in der statistischen Mechanik des Nichtgleichgewichts diskutieren und insbesondere die sogenannten Fluktuationstheoreme behandeln, welche ich anhand einfacher, experimentell realisierbarer Systeme illustrieren werde. Diese exakten Ergebnisse beschreiben die Wahrscheinlichkeit von Fluktuationen fern vom Gleichgewicht und erlauben es, die vertrauten Ungleichungen der makroskopischen Thermodynamik als Gleichungen zu formulieren. Die Fluktuationstheoreme spielen besonders für unser Verständnis kleiner Systeme, z. B. von Nanomaschinen und molekularen Motoren, einen wichtige Rolle und erlauben neue Einsichten in die Bedeutung der Irreversibilität und des zweiten Hauptsatzes der Thermodynamik.

10:30 10:59

Kaffeepause / Coffee break

61

Zeit time

ID

11:00

B T03

Boltzmann-Tagung Chair: Walter Kutschera Josef Stefan, Revolutionär und Pionier der Atomistik der Materie – Wege zum Verständnis der Bewegung der Atome Gero Vogl Universität Wien, Fakultät für Physik, Boltzmanngasse 5, 1090 Wien Josef Stefan war zusammen mit Boltzmann und Loschmidt prägender Lehrer der „Schule der Atomistik“ an der Universität Wien ab 1860. Deren Behauptung war: Die Atome existieren tatsächlich und sind nicht nur mathematische Hilfsvorstellungen. Diese Ansicht stand damals im Gegensatz zu den Ansichten vieler anderer Physiker wie u.a. des großen Ernst Mach, hat sich aber später triumphal bewahrheitet. Auf atomistischen Vorstellungen bauten Stefans Forschungen zur Diffusion wahrer Atome in Flüssigkeiten auf. Diese werde ich besprechen und sie in Beziehung dazu setzen, welche Erkenntnisse seither bei der Erforschung der Atomistik der Diffusion besonders in fester Materie erzielt wurden, manche ganz neue wieder an der Universität Wien.

11:45

B T04

Die „Perle“ Stefan-Boltzmann-Gesetz Heinrich Mitter Universität Graz, Institut für Physik, Universitätsplatz 5, 8010 Graz Vor 140 Jahren gelang es Boltzmann, die einige Jahre vorher von Stefan aus seinen Messresultaten vermutete Temperaturabhängigkeit der Energiedichte der Wärmestrahlung eines schwarzen Körpers als thermodynamisches Gesetz zu begründen. In der später von Lorentz als „echte Perle der theoretischen Physik“ bezeichneten Untersuchung fasst Boltzmann die Wärmestrahlung in einem Behälter als elektromagnetische Wellen im Sinn der Maxwell‘schen Elektrodynamik auf. Er verwendet Resultate Maxwells für den Druck, den elektromagnetische Wellen auf die Wände des Behälters ausüben, sowie für die innerhalb verteilte Energie. Die übrige Untersuchung wird mit Hilfe der klassischen (phänomenologischen) Thermodynamik durchgeführt. In dem Vortrag wird auf wesentliche Aspekte der Methodik von Boltzmanns Herleitung des Gesetzes eingegangen und die mehrfache physikhistorische Bedeutung gewürdigt. Anschließend wird eine moderne, quantentheoretische Herleitung präsentiert. Ausgangspunkt ist die relativistische Quantentheorie des elektromagnetischen Feldes, dessen Feldquanten die Photonen sind. Die Quantenstatistik eines idealen Photonengases führt sowohl zum Stefan-BoltzmannGesetz, als auch zum Planck‘schen Strahlungsgesetz.

12:30 13:59

Mittagspause / Lunch break

Zeit time

ID

14:00

B T05

Boltzmann-Tagung Chair: Heinz Krenn Geschichte der Atomhypothese Sonja Draxler and Max E. Lippitsch Universität Graz, Institut für Physik, Universitätsplatz 5, 8010 Graz Im ausgehenden 19. Jh. war die Hypothese der Existenz von Atomen ein Streitpunkt in der Physik, mit Boltzmann und Mach als die bedeutendsten Kontrahenten. Die Hypothese hatte schon eine lange Geschichte hinter sich. Erstmals formuliert im 5. Jh. v. Chr. von den Griechen Leukippos und Demokrit, wurde sie von Epikur und seinen Anhängern (3. Jh. v. Chr.) weiter entwickelt. Ein deutliches Zeichen für ihre Wichtigkeit setzt der Römer Lukrez in seinem Werk „De rerum natura“. Die Idee überlebte das Ende der Antike und wird in zahlreichen mittelalterlichen Werken behandelt. Die Gedanken dieser Abhandlungen bilden die Grundlage, auf der sich in der Neuzeit der moderne Atombegriff entwickelte. Aber ebenso lang gibt es auch die Skepsis gegenüber der Atomhypothese. Der Vortrag zeichnet Entwicklung der Hypothese im Spannungsfeld zwischen Zustimmung und Ablehnung nach.

62

14:45

B T06

Entropie ohne Atome Jakob Yngvason Universität Wien, Mathematische Physik, Boltzmanngasse 5, 1090 Wien Boltzmanns bahnbrechende Begründung des zweiten Hauptsatzes der Thermodynamik geht von einer atomistischen Vorstellung vom Aufbau der Materie aus, die von mehreren seiner Zeitgenossen nicht geteilt wurde. Zweifel an der Existenz von Atomen sind natürlich längst ausgeräumt, aber die Verknüpfung des zweiten Hauptsatzes mit Atomismus ist nicht so eng wie häufig angenommen. Eine allgemeine Herleitung des zweiten Hauptsatzes im Sinne eines stetigen Wachstums der Entropie als Funktion der Zeit für beliebige makroskopische Systeme gibt es bisher nicht. Das Problem liegt u.a. in dem Entropiebegriff selbst, denn insbesondere außerhalb von Gleichgewicht führt Boltzmanns Definition nur in Spezialfällen zu einer eindeutigen Entropie. In dem Vortrag wird diese Problematik thematisiert und eine von Elliott Lieb und dem Vortragenden angestellte Analyse des zweiten Hauptsatzes, die ohne Atome auskommt, vorgestellt.

15:30 15:59

Kaffeepause / Coffee break

Zeit time

ID

16:00

B T07

Boltzmann-Tagung Chair: Jakob Yngvason Das Sortieren von Atomen „One by One“ - Boltzmanns Vermächtnis in der Massenspektrometrie Walter Kutschera VERA Laboratorium, Fakultät für Physik, Universität Wien Massenspektrometrie kann als eine direkte Anwendung von Boltzmanns Überzeugung angesehen werden, dass Materie tatsächlich aus Atomen besteht und man durch Sortieren der Atome nach ihrer Masse die Zusammensetzung der Materie bestimmen kann. Um 1900 fing man daher an, aus der zu untersuchenden Probe einen Atomstrahl (eigentlich Ionenstrahl, weil die Atome elektrisch geladen waren) zu produzieren und diesen in Magneten abzulenken. Die Massenspektrometrie war geboren und der Engländer J.J. Thomson trennte damit 1913 als erster die Neonisotope (Ne-20 und Ne-22) voneinander. In der Folge wurden die stabilen Isotope von vielen Elementen mit dieser Methode entdeckt. Die Massenspektrometer wurden weltweit weiterentwickelt, wobei hier auch Josef Mattauch in Wien eine wichtige Rolle spielte. Als nach dem 2. Weltkrieg die Methode der Altersbestimmung mit dem in der Natur vorkommenden Radioisotop Kohlenstoff-14 (C-14) von dem Amerikaner Willard Libby entwickelt wurde (Nobelpreis für Chemie 1960), wurde zunächst C-14 über die wegen der langen Halbwertszeit (5700 Jahre) sehr seltenen radioaktiven Zerfälle nachgewiesen. Man versuchte daher auch dieses Isotop mit Massenspektrometrie, d.h. durch direktes Zählen der C-14 Atome in einer Probe, nachzuweisen. Da die Häufigkeit dieses Isotops relativ zu den stabilen Kohlenstoffisotopen extrem selten ist (C-12 : C-13 : C-14 = 0.99 : 0.01 : 0.000 000 000 001), war es nicht möglich, C-14 über „normale“ Massenspektrometrie zu messen. Erst die Verwendung eines Beschleunigers brachte Ende der 1970er Jahre den Durchbruch. Das Gebiet der Beschleunigermassenspektrometrie (Accelerator Mass Spectrometry = AMS) war geboren. An der Universität Wien wurde 1996 eine AMS-Anlage mit dem Namen VERA (Vienna Environmental Research Accelerator) in Betrieb genommen und damit können neben C-14 noch viele andere natürliche und auch durch den Menschen in die Umwelt gebrachte Spurenisotope gemessen werden. Das führt zu einer Vielzahl von interessanten Anwendungen in fast allen Bereichen unserer Umwelt, von Archäologie über Biologie bis zur Astrophysik. Über einige dieser Anwendungen soll berichtet werden.

63

16:45

B T08

Evolution der Kooperation Karl Sigmund Universität Wien, Fakultät für Mathematik, Oskar-Morgenstern-Platz 1, 1090 Wien Menschen besitzen eine ausgeprägte Neigung zur Kooperation. Die Entstehung und Entwicklung dieses Merkmals ist eines der spannendsten Gebiete der evolutionären Spieltheorie, und führt zu einer Vielzahl von Modellen mit interessanten, auf sozialen Wechselwirkungen beruhenden Dynamiken. Der Vortrag bietet einen Überblick über verschiedene Zugänge zu dem Thema (Verwandtenselektion, Gruppenselektion, direkte und indirekte Reziprozität) und verknüpft sie mit Äußerungen Darwins. In vielen Fällen bewies Darwin eine bemerkenswerte Einsicht in die komplexen Fragen der Evolution der Kooperation.

17:30

Ende der Veranstaltung / End of session

18:00 – 19:15

Umtrunk und Ausstellungsbesuch ECHOPHYSICS Öffentlicher Abendvortrag: Festsaal Schloss Pöllau

19:30 20:30

Univ.-Prof. Dr. Peter Schuster Institut für Theoretische Chemie, Universität Wien A T03

Evolution gesehen durch die Brillen der Physiker und der Biologen Die Entwicklung der Naturwissenschaften wurde Jahrhunderte lang durch die Physik und ihr Verhältnis zur Mathematik bestimmt. In gleicher Weise kann man zu Recht behaupten, dass die heutige Mathematik ohne Physik nicht das wäre, was sie ist. Völlig anders ist die gegenseitige Beziehung zwischen der erst etwa zweihundert Jahre alten Biologie zur Mathematik: Die konventionelle Theorie der Evolution wurde weitestgehend ohne eine einzige mathematische Formel entwickelt, obwohl sie auch schon zu Zeiten Darwins unschwer quantitativ formulierbar gewesen wäre. Physiker lieben allgemeine Konzepte, die in eine exakte Form gegossen werden können, wogegen konventionelle Biologen Details und Sammlungen hübscher Ausnahmen bevorzugen. Mit der Molekularbiologie nahmen Chemie, Physik und in ihrem Tross auch die Mathematik Einzug in die Biologie und auch in die Evolutionsforschung. Die heutigen Forschungs- und Analysetechniken stehen ohne massive Unterstützung durch Informatik und Mathematik auf verlorenem Posten. Im Referat wird eine mathematisierbare und mathematisierte Evolutionstheorie vorgestellt, die in ihrer Anwendung auf einfache Systeme präzise überprüfbare quantitative Aussagen machen kann. Insbesondere gelang durch die Konzeption von zellfreien, zur Evolution befähigten Experimentalsystemen der Brückenschlag zwischen chemischer Kinetik und Biologie. Die in den letzten dreißig Jahren entdeckten neuen Regulationsmechanismen der Zellentwicklung und Vererbung können nur durch quantitative Modelle auf molekularer Basis verstanden werden. Ohne quantitative Konzepte und ausgefeilte computertechnische Methoden ist die heutige Datenflut in der Biologie nicht beherrschbar.

64

GEP Samstag/Saturday, 27.09.2014, 9-13, Refektorium Schloss Pöllau

Zeit time

ID

09:00

GEP T01

GEP Chair: Peter M. Schuster Die ersten Galvanometer in der Zeit 1820 bis 1840 Franz Sachslehner University Vienna, Faculty of Physics, Boltzmanngasse 5/3331, 1090 Vienna Erst im Jahre 1820 entdeckte Hans Christian Oersted, dass ein Stromfluss durch einen geraden Draht eine Magnetnadel ablenken kann. In Windeseile verbreitete sich diese Erkenntnis über ganz Europa. Noch im gleichen Jahr beschäftigte sich André Marie Ampère mit der magnetischen Wirkung von Strömen und es wurde das Biot-Savart’sche Gesetz formuliert. Ebenso wurden 1820 die ersten Strommessgeräte gebaut, die man Multiplikatoren nannte, weil der zu Spulen geformte Draht die Wirkung auf eine Magnetnadel mit der Windungszahl vervielfachte. Johann Schweigger beschrieb 1820 den ersten Multiplikator, 1821 folgten Geräte von J. C. Poggendorff und James Cumming, weiters 1822 von Avogadro und 1823 von Oersted. 1825 präsentierte Leopoldo Nobili sein astatisches Galvanometer, indem er die besten Ideen seiner Vorgänger kombinierte. In Wien war z.B. Johann M. Ekling ein bekannter Hersteller von Multiplikatoren. Erst 1837 publizierte Claude S. M. Pouillet die Sinusbussole und die Tangentenbussole, die bei bekannter Horizontalkomponente des erdmagnetischen Feldes auch bei kleinen Strömen genauere Messungen ermöglichten.

65

09:30

GEP T02

Medizinische Physik – Physik im Dienste der Medizin. Der österreichische Medizinphysiker Dr. Fritz Hawliczek Werner Schmidt and Ferdinand Steger Institute for Radiooncology, Donauspital Vienna, Langobardenstrasse 122, 1220 Vienna Fritz Hawliczek (1920 – 1992) wurde in Wien geboren und verbrachte hier auch die meiste Zeit seines Lebens. Noch vor Kriegseintritt beendete er 1941 seine Dissertation an der Universität Wien, Institut für Radiumforschung, und war dort von 1945 –1955 Universitätsassistent. Dabei kam er erstmals mit „Medizinischer Physik“ in Berührung: „…1950 las H. Vetter, Arzt an der Univ. Wien, einen Artikel über die Injektion von Na-24, dessen Strömungsverhalten in Herzgefäßen mit einem Geiger-Müller-Zähler verfolgt werden konnte… Da ein derartiges Gerät damals kommerziell nicht erhältlich war, bot ihm Fritz Hawliczek uneigennützig seine Hilfe an. Er konstruierte aus einem mit einem Argon-Alkohol gefüllten Messingzylinder einen Gammadetektor mit einem Impulszähler sowie einen Bleikollimator, der an einem speziellen „Galgen“ über dem Patienten befestigt war. Dieser war so schwer, dass eine Person ständig achten musste, dass dieser nicht auf den Patienten fallen würde…” [1]. Eine andere Arbeit aus dieser Zeit lautete: „Über die Verwendung des Elektrokardiographen als Registriergerät in der Radiokardiographie.“ [2]. 1955 wechselte Hawliczek in die „Radiumtechnische Versuchsanstalt” (später: „Physikalisch-technische Prüfanstalt für Radiologie und Elektromedizin, Prüfstelle Lainz“) in Wien und baute sie zu einer im deutschsprachigen Raum weithin bekannten Institution aus. Er leitete sie bis 1986 und veröffentlichte in dieser Zeit mehr als 20 wissenschaftliche Arbeiten. Die Installation der ersten Hochenergie-Bestrahlungsgeräte Wiens (1959 Co-60, 1964 Betatron) wie auch der Bau eines neues Isotopenlabors (1970) erfolgten unter seiner Leitung. Darüber hinaus war sein Wissen in Strahlenschutzbelangen aus allen Bereichen der medizinischen Physik anerkannt; er wirkte auch als Experte am ersten Österreichischen Strahlenschutzgesetz (1972) mit. Als Erfinder entwickelte er ein Phosphatglas-Dosimetrie-System sowie einen halbautomatischen „Isodosenschreiber“ (beide patentiert), letzterer als Lizenz an BrownBoveri verkauft (1970). Bis 1972 war er Konsulent der damals noch „jungen“ IAEA in Wien und stellte ihr seine Bestrahlungsgeräte in Lainz für strahlenbiologische und dosimetrische Experimente sowie die Kalibrierung von Messkammern zur Verfügung. Ebenso war er in Kontakt mit dem Österreichischen Forschungszentrum Seibersdorf (eröffnet 1956) und dem Atominstitut der Österreichischen Universitäten (eröffnet 1961), beide mit Forschungsreaktoren ausgestattet. Im Alter von 67 Jahren veröffentlichte er auf dem “First Congress of the European Federation of Organisations of Medical Physics (EFOMP)” noch ein selbstgeschriebenes Programm für Kleincomputer zur Berechnung von Tiefendosen [3]. 1980 war er Gründungsmitglied der „Gesellschaft für Krankenhausphysik” (1985 in ÖGMP umbenannt) und ihr erster Präsident (1981-1984). In dieser Zeit wurde die Gesellschaft Mitglied der europäischen (EFOMP; 1981) und internationalen (IOMP; 1982) Medizinphysiker-Dachverbände. Er organisierte Jahreskongresse gemeinsam mit der DGMP (München, 1981; Nürnberg, 1985) sowie in Wien (1982) und Salzburg (1983). 1987 wurde er zum Ehrenmitglied der ÖGMP gewählt. Anhand seiner Karriere soll auch die Entwicklung der Medizinischen Physik in der 2. Hälfte des 20. Jahrhunderts in Österreich beschrieben werden. [1] History of Nuclear Medicine in Europe, H. Schicha et al. (ed.), p. 12-13; Schattauer, 2003 [2] Über die Verwendung des Elektrokardiographen als Registriergerät in der Radiokardiographie. Fritz Hawliczek, MIR 161 (7+8), Nr. 486, 1952 [3] Ein Kleincomputerprogramm zur Berechnung von Tiefendosen am Beispiel eines 6MeV Linear-beschleunigers. Hawliczek, R., Hawliczek, F., Binder, W. Medizinische Physik ‘ 87, p. 115-120, 1987, ISBN 3-925218-04-1

66

10:00

GEP T03

Halbleiter-Dioden zur Detektion von Radarsignalen – Entwicklung in den USA und in Deutschland 1940- 1948 Franz Pichler Johannes Kepler Universität Linz, Institut für Integrierte Schaltungen, Altenbergerstraße 69, 4040 Linz Die Verwendung von cm-Wellen im Rahmen der im 2. Weltkrieg eingesetzten Radartechnik verlangte die Entwicklung geeigneter Halbleiter-Dioden zur Signaldetektion. In den USA war 1940 mit Unterstützung der Militärbehörden am MIT das Radiation Laboratorium (Rad-Lab) gegründet worden, wo diese Aufgabe zusammen mit Universitäten (u.a. mit der Purdue University, wo von Prof. Karl Lark-Horovitz eine Forschungsgruppe dafür aufgebaut wurde) und der Industrie (hier vor allem die Bell Laboratories, Murray Hill, N.J.) wahrgenommen wurde. In Deutschland wurden bei Telefunken durch die Physiker Mataré und Seiler geeignete Silizium-Dioden, bei Siemens & Halske Germanium-Dioden unter Mitwirkung der Physiker Welker und Spenke entwickelt. Der Vortrag behandelt dies, wobei für die USA die von Milman und Smits bei den Bell Laboratories herausgegebenen Bücher und für Deutschland die Aachener Dissertation von Kai Handel als wichtige Quellen herangezogen werden.

10:30 10:59

Kaffeepause / Coffee break

Zeit time

ID

11:00

GEP T04

GEP Chair: Heinz Krenn Meteorologische Forschung an der Universität Graz während des 2. Weltkriegs Bruno Besser Institut für Weltraumforschung, ÖAW, Schmiedlstr. 6, 8042 Graz Im Jahr 1941 wurde am damaligen Institut für Meteorologie und Geophysik der Universität Graz eine außerordentliche Professur geschaffen. Die Stelle wurde mit dem schon 1940 ans Grazer Institut gewechselten Lehrbeauftragen für Meteorologie, Johannes Letzmann (18851971), besetzt. Letzmann stammte aus Livland und war ab 1913 als Assistent am meteorologischen Institut der Universität Dorpat (heute: Tartu) tätig. In den Jahren 1939 und 1940 fungierte er als provisorischer Leiter des Physikinstituts der Universität Posen (heute: Poznan, Polen). Nachdem im Jahr 1945 per Gesetz alle nach 1938 stattgefundenen Veränderungen in Universitäten aufgehoben wurden, wurde Prof. Letzmann in den Ruhestand versetzt. In Graz war Prof. Letzmann bei seinem Dienstantritt 1940 kein Unbekannter mehr, war er doch schon vorher öfter Gast bei Prof. Alfred Wegener am Institut und verbrachte das Jahr 1928 ebenda. Während seiner Grazer Zeit (ab 1941) leitete Prof. Letzmann auch das extra gegründete Forschungsinstitut für „Atmosphärische Wirbelforschung“. Als ausgewiesener Experte in der Tornado- und Wirbelsturmforschung beschäftigte er sich mit Arbeiten, die heute unter dem Sammelbegriff „Turbulenzforschung“ zusammengefasst werden könnten.

67

11:30

GEP T05

Peter Salcher – Other works carried out in Fiume (Rijeka) Ana Alebić-Juretić University of Rijeka, Teaching Institute of Public Health, Croatia Peter Salcher is recently rediscovered as underrated experimentalist and collaborator of Ernst Mach in early investigation of gas dynamic and supersonic aerodynamic phenomena. I do hope, as many physicists who came in contact with the complete correspondence between two scientists, that this injustice will be corrected accordingly. Besides this world known experiment, during his 35 years of teaching at the I&R. Naval Academy in Fiume (nowadays Rijeka, Croatia), he was active in other fields of research, as well as in social life in the town. He was one of the founders of the Club for natural sciences in Rijeka (Naturwissenschaftlicher Club in Fiume) that was founded on November 23rd 1883, where he held important positions as secretary, vice-president and president. His merit was also publishing the Bulletin of the Club for natural sciences, a bilingual (italian-german) annual publication reporting not only the activities and lectures held in the Club, but also quality papers on various subjects of interest for the municipality. He himself gave 33 lectures in 20 years, mostly dealing with physics and technique, but also medicine and education. With his collaborator S. Riegler, he gave lectures on „Taking photographs on fast movements” already on May 7th, 1886, presenting the results of the experiment done in team with Ernst Mach. Only three weeks after the famous Roentgen lecture in Würtzburg, Salcher gave the same in the Club, taking first two photographs with X-rays. The lecture was a great success, so that on his initiative a Roentgen Committee was founded with the task to purchase the Roentgen apparatus. This was realized in mid-1897, and accompanied with the second lectures on X-rays. The apparatus was used for medical diagnosis and two years later was left to the municipal hospital. Peter Salcher also took charge of the modern meteorological station founded by the Viennese Academy and Adriatic Commission in November 1868. He wrote the first book on „The Climate in Fiume (Rijeka) and Abbazia (Opatija)”, where he evaluated the meteorological data in the same way that is currently done. For this reason these data might be used in climate change studies. At the end of his professional career, in 1909, with Dr. Trippold from Abbazzia (Opatija) he undertook measurements of radioactivity of sea water in the Rijeka Bay using an electroscope. From the fact that radioactivity was found higher in the vicinity of the settlements, he concluded that it should be of antropogenic origin and called for reexamining the use of radioactivity (emanates) for wellness reasons. Besides in science, Salcher was also active in the Photographic sections of the Club and participated to various exhibitions at the turn of the centuries. Some of his photographs are still used for publishing purposes.

68

12:00

Case study of solar eclipse occurred on 10th July 1600

GEP T06

Mohammed Boudjada and Bruno Besser Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz We report on solar eclipses observed in Europe at the end of the sixteenth and the beginning of the seventeenth century. We mainly consider the solar eclipses observed and discussed by Tycho Brahe and Johannes Kepler in their manuscripts and letters. We emphasis on the ‘procedure’ for preparation of the observation: the prediction of the date and the time of the eclipse, the used instruments and the way some geometrical parameters are derived from the eclipse measurements. We analyze the particular features of the solar eclipse which occurred on 10 July 1600, investigated by Kepler in Graz and Brahe in Prague. We show that in the investigated period the solar eclipses were partials. This means a limited observation time of the eclipse, less than few minutes, which raised real difficulties in making accurate measurements.

12:30

Experimentally verified violation of the law of reflection directly disproves length-contraction

GEP T07

Karl Mocnik Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz Following with thorough scrutiny Michelson's historical “A Plea for Light-waves” of 1888 [1], the aberration of light, contrary to general belief receives the role of a criterion distinguishing between the wave and the corpuscle standpoint. The direct consequence inevitably is to abandon length-contraction hypothesis [2] altogether. Consequently, also the prediction of aether-drift in his interferometer has to be abandoned as it wasn't classical but was a hypothesis neglecting both the full Euclidean geometrical / physical contents of the aberration and Doppler phenomenon [3]. An optical device (modified “bifilar-whorllight-whirl”) constructed on the basis of an extended theory [4] according to a supplementary suggestion of Michelson and Morley in their 1887 paper on ether-drift, exploits the full content of the aberration, and proves both the physical existence of the violation of the law of reflection and the entire non-existence of moving photons in space. [1] [2] [3] [4]

Michelson, A. A., Amer. Assoc. Advancement of Science, Vol. 37, 3-14, 1888. Mocnik, K., 37th Beitr. zum Mathematikunterricht 2003, Dortmund, p. 445, 2003. Mocnik, K., 38th Beitr. zum Mathematikunterricht 2004, Augsburg, p. 385, 2004. Mocnik, K., Proc. 9th Int. Conf. “Probl. of Geocosmos”, St. Petersburg, 2010.

13:00

Ende der Veranstaltung / End of session

13:15 – 14:15

Ausstellungsbesuch ECHOPHYSICS

69

Namensindex Vorname Nachname Fachgruppe Präsentationsnummer Seite Erstautorpräsentation in Fettbuchstaben

Joachim Burgdörfer AMP T08 S. 46 Max Burian CM T43 S. 13

A Hartmut Abele CM T41 S. 13, FAKT T21 S. 31, FAKT P03 S. 379, FAKT P04 S. 38 Markus Aichhorn PLE T02 S. 49 Ana Alebić-Juretić GEP T05 S. 68 Mark Alford FAKT T64 S. 41 Reinhard Alkofer FAKT T33 S. 33, FAKT T36 S. 34, FAKT T62 S. 41 Reinhard Alkofer FAKT T63 S. 41 Katrin Amann-Winkel PR T01 S. 50 Heinz Amenitsch CM T45 S. 14, CM P01 S. 23, CM P03 S. 24 Hannes Antlinger CM T62 S. 20 Thomas Antretter CM T63 S. 20 Florian Apolloner CM T47 S. 15, CM P02 S. 23, CM P07 S. 25 Diego Arbó AMP T08 S. 46 Salvador Miret-Artés CM P02 S. 23, CM P07 S. 25 Bastian Aurand AMP T02 S. 43 Kirmanj Aziz CM T52 S. 16

C Fernando Cacho-Nerin CM P03 S. 24 Peter Caradonna FAKT T14 S. 30 Michael Cargnelli FAKT T51 S. 39 Miran Čeh CM T66 S. 22 Samir Cerimovic CM T62 S. 20 Stefan Clara CM T62 S. 20 Paul Corkum AMP T06 S. 45 Gunther Cronenberg FAKT T21 S. 31 Caterina Czibula CM P12 S. 27 D Christoph Dellago B T02 S. 61 Martin Demker CM T46 S. 15 Armin Denoth LHS T01 S. 53 Ulrike Diebold CM T12 S. 5, CM T14 S. 6, CM T15 S. 7, CM T21 S. 7, CM P08 S. 26, CM P10 S. 26 Martin Diermaier FAKT T13 S. 30, FAKT T14 S. 30 Jürgen Thomas Drachta CM T55 S. 17 Sonja Draxler B T05 S. 62 Jeppe Dyre CM T51 S. 16

B Gerald Badurek CM T42 S. 13, FAKT T53 S. 39 Andrius Baltuska AMP T06 S. 45, AMP T07 S. 45, AMP T08 S. 46 Christian Balzer CM P04 S. 24 Stefan Baumgartner FAKT T53 S. 39 Roman Beigelbeck CM T58 S. 18, CM T62 S. 20 Giorgio Benedek CM T47 S. 15 Benjamin von Berg LHS 14 S. 54 Thomas Bergauer FAKT T46 S. 36 Bernhard Berger FAKT T53 S. 39 Manfred Berger FAKT P06 S. 38 Stephen Berkebile CM T22 S. 8 Carolina Berucci FAKT T51 S. 39 Bruno Besser GEP T04 S. 67, GEP T06 S. 69 Tobias Binder AMP T05 S. 44 Peter Blaha CM T14 S. 6 Roland Bliem CM T14 S. 6, CM T15 S. 7 Adrian Lorenz Blum FAKT T63 S. 41 Lynn A. Boatner CM T12 S. 5 Helmuth Böck E T06 S. 3 Helga M. Böhm CM T55 S. 17 Mohammed Boudjada GEP T06 S. 69 Leander Brandl (LHS 14 S. 54) Johannes Brandstetter FAKT T65 S. 41 David Bricher FAKT T44 S. 35 Frederic Brünner FAKT T32 S. 33 Florian Brunbauer CM P08 S. 26 Stefan Enrico Brunner FAKT T45 S. 36 Thomas Voglhuber-Brunnmaier CM T58 S. 18, CM T62 S. 20 Florian Buchsteiner FAKT T46 S. 36 Ryszard Buczko CM T33 S. 10 Paul Bühler FAKT T22 S. 30, PLE T03 S. 50

E Boris Ecker AMP T02 S. 43 Christian Ecker FAKT T31 S. 33 Gernot Eichmann FAKT T63 S. 41 Sonia Erattupuzha AMP T07 S. 45 Maxim Erko CM P04 S. 24 Wolfgang E. Ernst CM T34 S. 11, CM T35 S. 11, CM T47 S. 15, CM T57 S. 17, CM P02 S. 23, CM P07 S. 25 F Christian Fabjan PLE T04 S. 52, LHS T03 S. 54 Martin Faccinelli CM T36 S. 12 Elisabeth Fahrngruber EXOL P02 S. 59 Michael Fellner LHS 12 S. 54 Pascal Ferstl CM T14 S. 6 Alexander Fian CM T24 S. 9, CM P11 S. 27 Hanno Filter FAKT T21 S. 31 Maria Firneis LHS T04 S. 55, EXOL P01 S. 59, EXOL P02 S. 59, EXOL P03 S. 59, EXOL P04 S. 60 Christian S. Fischer FAKT T36 S. 34 Stefan Förster PR T02 S. 51 Oliver Forstner FAKT T54 S. 40 Cesare Franchini CM T21 S. 7 Harald Frey E T03 S. 2 Susanne Friedreich PR T03 S. 51 Gerhard Fritz-Popovski CM T43 S. 13, CM T44 S. 14 G Oscar Gamba CM T14 S. 6, CM T15 S. 7

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Christian Ganser CM P12 S. 27 Adriano Garonna FAKT T55 S. 40 Peter Geltenbort FAKT T21 S. 31, FAKT T53 S. 39 Stefan Gerhold CM T21 S. 7 Holger Gies FAKT T33 S. 33 Robin Glattauer FAKT T42 S. 35, FAKT P06 S. 38 Christoph Gösselsberger FAKT T53 S. 39 Christian Gösweiner CM T47 S. 15, CM P02 S. 23, CM P07 S. 25 Robin Golser FAKT T54 S. 40 Erich Gornik PLE T04 S. 52, LHS T03 S. 54 Davor Gracin CM T66 S. 22 Stefanie Gräfe AMP T08 S. 46 Jakob Grilj AMP T04 S. 44 Leonhard Grill CM T01 S. 5, CM P13 S. 27 Walter Grimus FAKT T61 S. 40 Werner Grogger CM T34 S. 11, CM T35 S. 11 Gernot Gruber CM T37 S. 12 Lukas Gruber FAKT T45 S. 36 Daniel Grumiller FAKT T23 S. 32, FAKT T24 S. 32 Markus Gühr AMP T04 S. 44 Achim Gütlein FAKT T11 S. 29

K Daniil Kartashov AMP T06 S. 45, AMP T07 S. 45, AMP T08 S. 46 Franz Keplinger CM T58 S. 18, CM T62 S. 20, CM P14 S. 28 Klaus Kern PLE T01 S. 49 Anatoli Kheifets AMP T06 S. 45 Stefan Kirnstoetter CM T36 S. 12 Gabor-Imre Kiss EXOL P03 S. 59 Markus Kitzler AMP T06 S. 45, AMP T07 S. 45, AMP T08 S. 46 Christoph Klaushofer FAKT T14 S. 30, FAKT T22 S. 32 Stefan Klima CM P09 S. 26 Gregor Klinser CM P05 S. 24 Michael Klopf FAKT P04 S. 38 Holger Kluck FAKT T11 S. 29 Daniel Knez CM T34 S. 11, CM T35 S. 11 Valentin Knünz FAKT T65 S. 41 Markus Koch CM T37 S. 12, AMP T04 S. 44 Christian Kohlfürst FAKT T33 S. 33 Bernadette Kolbinger FAKT T13 S. 30 Georg Koller CM T22 S. 8, CM T23 S. 8 Stefan Koller CM P05 S. 24 Gertrud Konrad FAKT T15 S. 31, FAKT P03 S. 37, FAKT P04 S. 38 Alexander Koschik FAKT T55 S. 40 Gerald Kothleitner CM T65 S. 21 Ilse Krätschmer FAKT T65 S. 41 Petra Kragl (LHS 13 S. 54) Andreas Krassnigg FAKT T35 S. 34 Patrick Kraus CM T47 S. 15, CM P02 S. 23, CM P07 S. 25 Dominik Kreil CM T55 S. 17 Harald Kren CM P05 S. 24 Heinz Krenn CM T53 S. 16, CM P05 S. 24, B T01 S. 61 Georg Kresse CM T33 S. 10, CM T51 S. 16 Erwin Kronberger (LHS 11 S. 54) Matthias Kronberger FAKT T55 S. 40 Friedemar Kuchar CM T63 S. 20 Thomas Kühel AMP T02 S. 43 Tobias Kulenkampff FAKT T55 S. 40 Christoph Kurfuerst FAKT T55 S. 40 Walter Kutschera PLE T04 S. 52, LHS T03 S. 52, B T07 S. 63

H Georg Haberfehlner CM T65 S. 21 Peter Hadley CM T36 S. 12, CM T37 S. 12 Philipp Haim LHS 13 S. 54 Daniel Halwidl CM P08 S. 26, CM P10 S. 26 Lutz Hammer CM T14 S. 6 Rene Hammer CM T24 S. 9 Xianfeng Hao CM T21 S. 7 Philipp Hartlieb CM T63 S. 20 Markus A. Hartmann CM T61 S. 19 Andreas W. Hauser CM T57 S. 17 Wolfgang Heiss CM T44 S. 14 Bastian Henne CM T13 S. 6 Thomas Hilger FAKT T34 S. 34 Masahiro Hino FAKT T53 S. 39 Regina Hitzenberger LHS T04 S. 55, EXOL P01 S. 59 Raphael Hobbiger CM T55 S. 17 Ferdinand Hofer CM T34 S. 11, CM T35 S. 11 Andreas Hoffmann AMP T02 S. 43 Michael Hollerer CM P11 S. 27, CM T24 S. 9 Markus Hopfer FAKT T36 S. 34, FAKT T62 S. 41 Wilfried Hortschitz CM P14 S. 28 Markus Q. Huber FAKT T63 S. 41 Nicola Hüsing CM P04 S. 24 Jan Hulva CM P08 S. 26, CM P10 S. 26 Felix Hummel CM T51 S. 16 Kerstin Hummer CM T33 S. 10

L Johannes Lachner FAKT T54 S. 40 Florian Lackner CM T34 S. 11 Johannes Lahner FAKT T54 S. 40 Björn Landgraf AMP T02 S. 43 Wolfgang Langbein CM T56 S. 17 Roman Lassnig CM T24 S. 9, CM P11 S. 27 Rainer T. Lechner CM T43 S. 13, CM T44 S. 14, CM T45 S. 14 Lukas Lechner FAKT T43 S. 35 Andreas Lederbauer E T04 S. 2 Helmut Leeb FAKT T52 S. 39, FAKT T66 S. 42 Sebastian Lehner FAKT T13 S. 30 Johannes Leitner LHS T04 S. 55, EXOL P01 S. 59, EXOL P02 S. 59, EXOL P03 S. 59, EXOL P04 S. 60 Max E. Lippitsch B T05 S. 62

I Maria Irakleidou FAKT T23 S. 32, FAKT T24 S. 32 Christian Irmler FAKT T46 S. 36 Igor Ivanov AMP T06 S. 45 Atsushi Iwasaki AMP T07 S. 45 J Simon Jaekel CM P13 S. 27 Bernhard Jakoby CM T58 S. 18, CM T62 S. 20 Tobias Jenke FAKT T21 S. 31 Erwin Jericha CM T42 S. 13, FAKT T53 S. 39 Krunoslav Juraić CM T66 S. 22

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Jiri Pavelec CM P08 S. 26, CM P10 S. 26 Ulf Pedersen CM T51 S. 16 Liviu Penescu FAKT T55 S. 40 Emilie Perre CM T45 S. 14 Alexander Petutschnigg CM T46 S. 15 Andreas Pichler FAKT T12 S. 29, FAKT P05 S. 38 Franz Pichler GEP T03 S. 67 Florian Pipper FAKT P05 S. 38 Johanna Pitters FAKT T54 S. 40 Peter Pölt CM T64 S. 21 Walter Poetz CM T32 S. 10, CM P06 S. 25 Cecilia Poletti CM T65 S. 21 Gerhard Fritz-Popovski CM T43 S. 13, CM T44 S. 14 Johann V. Pototschnig CM T57 S. 17 Gernot Pottlacher CM T52 S. 16 Christian Prehal CM T45 S. 14 Florian Preis FAKT T24 S. 32 Volker Presser CM T45 S. 14 Alfred Priller FAKT T54 S. 40 Christian Pronegg (LHS 12 S. 54) Peter Puschnig CM T22 S. 8, CM T23 S. 8

Xiaojun Liu AMP T06 S. 45 Erik Lötstedt AMP T07 S. 45 Iva Lovrekovic FAKT T23 S. 32, FAKT T24 S. 32 Peixiang Lu AMP T06 S. 45 Leo Ludick PLE T04 S. 52, LHS T03 S. 54 Patrick Ludl FAKT T61 S. 40 Wolfgang Lukas FAKT T41 S. 34 M Wilfried Mach CM T42 S. 13, FAKT P04 S. 38 Patrick Mai CM T56 S. 17 Chloé Malbrunot FAKT T13 S. 30, FAKT T14 S. 30 Helmut Malleck E T05 S. 2 Friedl Markus FAKT T46 S. 36 Benedetta Marmiroli CM P01 S. 23, CM P03 S. 24 Johann Marton FAKT T12 S. 29, FAKT T45 S. 36, FAKT P05 S. 38, FAKT T51 S. 39 Martin Martschini FAKT T54 S. 40 Oswald Massiczek FAKT T13 S. 30, FAKT T14 S. 30 Leopold Mathelitsch PLE T04 S. 52, LHS T03 S. 54 Michael Mayrhofer-Reinhartshuber CM P02 S. 23 Eamon McDermott CM T14 S. 6 Robert McNees FAKT T23 S. 32, FAKT T24 S. 32 Ronald Meisels CM T63 S. 20 Bernd Meyer CM T12 S. 5 Albrecht Miletzky CM P12 S. 27 Salvador Miret-Artés CM P02 S. 23, CM P07 S. 25 Monika Mirkowska CM P09 S. 26 Heinrich Mitter B T04 S. 62 Mario Mitter FAKT T63 S. 41 Karl Mocnik GEP T07 S. 69 Roland Johann Morak CM P04 S. 24 Daniel Moser FAKT P03 S. 37 Maurizio Musso CM T46 S. 15

R Robert Raab FAKT T53 S. 39 Michael Ramsey CM T22 S. 8, CM T23 S. 8 Martin Ratschek CM T57 S. 17 Anton Rebhan FAKT T32 S. 33 Tobias Rechberger CM T42 S. 13 Gudrun Reichenauer CM P04 S. 24 R Michael Mayrhofer-Reinhartshuber CM P02 S. 23 Eva M. Reinisch CM T22 S. 8, CM T23 S. 8 Roland Resel CM T68 S. 22 Andreas Reyer CM T46 S. 15 Max Riegler FAKT T25 S. 33 Michele Riva CM T21 S. 7 Andrei Rogalev CM T13 S. 6 Stefan Roither AMP T06 S. 45, AMP T07 S. 45, AMP T08 S. 46

N S. Soran Nabavi CM T61 S. 19 Christophe Nacci CM P13 S. 27 Manfred Nachtnebel CM T64 S. 21 Katsuro Nakamura FAKT T46 S. 36 Shinichi Namba AMP T02 S. 43 Fernando Cacho-Nerin CM P03 S. 24 Doris Steinmüller-Nethl CIP T03 S. 58 Andreas Ney CM T13 S. 6 Verena Ney CM T13 S. 6 Heshmat Noei CM T15 S. 7 Sebastian Nowak FAKT T53 S. 39

S Franz Sachslehner GEP T01 S. 65 Julia Salapa LHS 11 S. 54 Barbara Sartori CM P01 S. 23, CM P03 S. 24 Mathias Sassermann CM T56 S. 17 Clemens Sauerzopf FAKT T13 S. 30, FAKT T14 S. 30; FAKT P01 S. 37, FAKT P02 S. 37 Heiko Saul FAKT P04 S. 38 Thilo Sauter CM P14 S. 28 Robert Schennach CM P12 S. 27 Boris Scherwitzl CM T68 S. 22 Michael Schmid CM T12 S. 5, CM T14 S. 6, CM T15 S. 7; CM T21 S. 7, CM P08 S. 26, CM P10 S. 26 Siegfried Schmid FAKT T46 S. 36 Ulrich Schmid CM T58 S. 18 Werner Schmidt GEP T02 S. 66 Claus Schmitzer FAKT T55 S. 40 Alexander Schmon CM T52 S. 16 Georg Schnabel FAKT T52 S. 39, FAKT T66 S. 42 M. Alexander Schneider CM T14 S. 6 Michael Schneider CM T58 S. 18 Markus Schöffler AMP T06 S. 45, AMP T07 S. 45 Magdalena Schreilechner CM P06 S. 25 Karina Schulte CM T21 S. 7

O Tatsuro Oda FAKT T53 S. 39 Hannes Offenbacher CM T23 S. 8 Katharina Ollefs CM T13 S. 6 Herbert Orth FAKT T45 S. 36 Angelina Orthacker CM T65 S. 21 Markus Ostler CM T22 S. 8 P Denis Parganlija FAKT T32 S. 33 Oskar Paris CM T43 S. 13, CM T44 S. 14, CM T45 S. 14, CM P04 S. 24 Gareth Parkinson CM T14 S. 6, CM T15 S. 7, CM P08 S. 26, CM P10 S. 26 Alessandro Pascolini E T01 S. 1 Gerhard Paulus AMP T07 S. 45

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Thorsten Schumm AMP T01 S. 43 Peter Schuster A T03 S. 50, S. 64 Elisabeth Schwab CIP T01 S. 57, CIP T04 S. 58 Christoph Schwanda FAKT T43 S. 35, FAKT T44 S. 35, FAKT P06 S. 38 Kai Schwenzer FAKT T64 S. 41 Steffen Seiler CM T12 S. 5 Enikoe Seres AMP T01 S. 43, AMP T02 S. 43, AMP T03 S. 44 Jozsef Seres AMP T01 S. 43, AMP T02 S. 43, AMP T03 S. 44 Knud Seufert CM P13 S. 27 Thomas Seyller CM T22 S. 8 Hexi Shi FAKT T12 S. 29 Josef Siess CIP T01 S. 57, CIP T04 S. 58 Karl Sigmund B T08 S. 64 Zdravko Siketić CM T66 S. 22 Martin Simon FAKT T13 S. 30, FAKT T14 S. 30 Emily Sistrunk AMP T04 S. 44 Lorenz von Smekal FAKT T63 S. 41 Christian Spielmann AMP T02 S. 43, AMP T03 S. 44 Stefan Spirk CM P12 S. 27 Thomas Srdinko FAKT T66 S. 42 Leopold Stadler LHS T02 S. 53 Barbara Stadlober CM T24 S. 9, CM P11 S. 27 Andre Staudte AMP T06 S. 45 Ferdinand Steger GEP T02 S. 66 Peter Steier FAKT T54 S. 40 Harald Steiner CM P14 S. 28 Helmut Steininger FAKT T46 S. 36 Doris Steinmüller-Nethl CIP T03 S. 58 Dominik Steinschaden FAKT P05 S. 38 Johannes Steurer CM T34 S. 11 Andreas Stierle CM T15 S. 7 Michael Stifter CM P14 S. 28, CM T58 S. 18 Bernd Striedinger CM T24 S. 9, CM P11 S. 27 Ken Suzuki FAKT T45 S. 36, FAKT P06 S. 38

V Zoltán Vörös CM T56 S. 17 Gero Vogl B T03 S. 62 Thomas Voglhuber-Brunnmaier CM T58 S. 18, CM T62 S. 20 Alexander Volk CM T34 S. 11, CM T35 S. 11 Milan Vujinovic FAKT T63 S. 41 W Friedrich Wagner A T01 S. 3, S. 36, S. 46, S. 47 Margareta Wagner CM T12 S. 5 Chuanliang Wang AMP T06 S. 45 Xiangzun Wang FAKT P04 S. 38 Yanlan Wang AMP T06 S. 45 Zhiming Wang CM T21 S. 7 Doreen Melari Warjri FAKT T66 S. 42 Alexander Wastl FAKT T55 S. 40 Werner Watzenig E T02 S. 1 Gerhard Weihs EXOL P04 S. 60 Gregor Weihs CM T56 S. 17 Daniel Weingarth CM T45 S. 14 Eberhard Widmann FAKT T13 S. 30, FAKT T14 S. 30, FAKT T51 S. 39 Fabrice Wilhelm CM T13 S. 6 Richard Williams FAKT T63 S. 41 Laurentius Windholz AMP T05 S. 44 Andreas Windisch FAKT T62 S. 41, FAKT T64 S. 41 Katrin Amann-Winkel PR T01 S. 50 Adolf Winkler CM T24 S. 9, CM T68 S. 22, CM P11 S. 27 Georg Winkler AMP T01 S. 41, AMP T02 S. 43 Michael Wolf FAKT T14 S. 30 Thomas J. A. Wolf AMP T04 S. 44 Roland Würschum CM T53 S. 16, CM P05 S. 24 X Xinhua Xie AMP T06 S. 45, AMP T07 S. 45, AMP T08 S. 46

T Johannes Tändl CM T65 S. 21 Ruth-Sophie Taubner LHS T04 S. 55, EXOL P01 S. 59 Christian Teichert CM P09 S. 26, CM P12 S. 27 Philipp Thaler CM T34 S. 11, CM T35 S. 11 Martin Thalhammer FAKT T21 S. 31 Richard Thalmeier FAKT T46 S. 36 Felicitas Andrea Thorne FAKT T43 S. 35, FAKT T44 S. 35, FAKT P06 S. 38 Gianluca Tondi CM T46 S. 15 Stefan Toplovec CM T53 S. 16, CM P05 S. 24 Michael Toifl CM T63 S. 20 Christos Triantafillidis CM P04 S. 24

Y Kaoru Yamanouchi AMP T07 S. 45 Maksym Yarema CM T44 S. 14 Hao Yin FAKT T46 S. 36 Jakob Yngvason B T06 S. 63 Z Alexander Zdarzil CM T42 S. 13 Anton Zeilinger A T02 S. 50, S. 52 Richard Zemann CIP T02 S. 57 Li Zhang AMP T06 S. 45 Yueming Zhou AMP T06 S. 45 Johann Zmeskal FAKT T13 S. 30, FAKT T14 S. 30, FAKT P05 S. 38, FAKT T51 S. 39

U Thomas Ules CM T22 S. 8, CM T23 S. 8

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Karte von Pöllau L406

V3

L431

L432

G2

Schloss Pöllau Parkplatz

V1 V2

L432

Park & Ride L406

G1

Volksbank

Eingang

V4 V5 Rathaus G3

L406

Hauptplatz

G4

Anfahrt von Wien/Graz

Grafik & Layout: Oliver L.P. Schuster © 2014 echophysics

Veranstaltungsräume V1 V2 V3 V4 V5

Refektorium Schloss Festsaal Schloss Festsaal Raiffeisen Festsaal Sparkasse Festsaal Rathaus

Gasthäuser in Schlossnähe G1 G2 G3 G4

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Schlossstüberl Eckhart Gasthaus Schreiner Gasthof Ritter Gasthof Stelzer-Hubmann

Plan vom Schloss Pöllau 1. Obergeschoss und Eingang Barrierefrei

Parkplatz

V1 P1

V1 Refektorium Schloss M1 Ausstellung ECHOPHYSICS P1 Posterpräsentationen G1 Schlossstüberl Eckhart

U1

R1 Anmeldung und Registrierung U1 Firmenstände V2 Festsaal Schloss B1 Buffet

Treppenaufgang

G1

M1

Haupteingang

2. Obergeschoss

Treppenaufgang

R1

Grafik & Layout: Oliver L.P. Schuster © 2014 echophysics

V2 B1

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