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Calendar of Physics Talks Vienna
| Bulk characterization and surface properties of In2O3(001) single crystals |
| Speaker: | Daniel Hagleitner (Technische Universität Wien, Institut für Angewandte Physik) |
| Abstract: | Indium oxide, In2O3 is an important semiconductor with a wide range of technical applications including Organic Light Emitting Diodes, Organic Photovoltaic Cells, gas sensing, and transparent infrared reflectors. The present diploma thesis comprises a comprehensive bulk and surface investigation of high-quality In2O3(001) single crystals. The transparent-yellow, cube-shaped single crystals were grown by the flux method. The results of the applied techniques – including four-point-probe measurements, SIMS, XRD, STM, scanning tunneling spectroscopy and photoelectron spectroscopy – will be presented and discussed. |
| Date: | Mon, 07.11.2011 |
| Time: | 14:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, Sitzungszimmer, Turm C (rote Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| STM study of oxygen adsorption at defect sites at the TiO2 anatase (101) surface |
| Speaker: | Martin Fidler (Technische Universität Wien, Institut für Angewandte Physik) |
| Abstract: | The adsorption of oxygen at low temperatures (105 K) was investigated by LT-STM on the TiO2 anatase (101) surface. Tersoff-Haman-STM simulations are in good agreement with our experimental data. Surface oxygen vacancy defects were generated by bombarding the surface with 500 eV electrons at 105 K and analyzed with STM. The interaction between vacancies and oxygen shows interesting results.
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| Date: | Mon, 07.11.2011 |
| Time: | 14:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, Sitzungszimmer, Turm C (rote Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| Quantum interferometric visibility as a witness of general relativistic proper time |
| Speaker: | Magdalena Zych (Uni Wien) |
| Abstract: | Current attempts to probe general relativistic effects in quantum mechanics focus on precision measurements of phase shifts in matter-wave interferometry. Yet, phase shifts can always be explained as arising due to an Aharonov-Bohm effect, where a particle in a flat space-time is subject to an effective potential. Here we propose a novel quantum effect that cannot be explained without the general relativistic notion of proper time. We consider interference of a "clock" - a particle with evolving internal degrees of freedom - that will not only display a phase shift, but also reduce the visibility of the interference pattern. According to general relativity proper time flows at different rates in different regions of space-time. Therefore, due to quantum complementarity the visibility will drop to the extent to which the path information becomes available from reading out the proper time from the "clock". Such a gravitationally induced decoherence would provide the first test of a genuine general relativistic notion of proper time in quantum mechanics. |
| Date: | Tue, 08.11.2011 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Sabine Ertl |
| String- and brane-localized causal fields in a strongly nonlocal model (by Buchholz and Summers) |
| Speaker: | Sabina Alazzawi (Univ.Wien) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 08.11.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | J. Yngvason |
| Relating the N=4 SYM low-energy effective action with D3 brane on AdS_5 x S5 background |
| Speaker: | Igor Samsonov (INFN, Padua) |
| Abstract: | According to the AdS/CFT correspondence, the action for a D3 brane
moving in curved AdS_5 x S5 background of IIB theory should
coincide with the quantum low-energy effective action in the N=4
SYM theory. This correspondence can be checked explicitly for
several leading terms in these actions, in particular, for
F4/X4, F6/X8 and for the Wess-Zumino terms. Here F is the
Maxwell field strength and X is the R-invariant combination of
six scalar fields in the N=4 SYM theory. We discuss some
superspace methods to study this matching. |
| Date: | Tue, 08.11.2011 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | Harold Steinacker |
| X-ray laser spectroscopy of plasmas: reproducing the surroundings of black-holes in the laboratory |
| Speaker: | Priv.-Doz. Dr. José R. Crespo López-Urrutia (Max-Planck-Institut für Kernphysik, Heidelberg/D) |
| Abstract: | Laser spectroscopy in the soft X-ray region has become possible through the combination of free-electron lasers and trapped highly charged ions (HCI). Their electronic structure offers narrow bound-to-bound transitions in the X-ray domain, which can be resonantly excited with photons from fourth-generation sources. Furthermore, photoionization of HCI, widely found in astrophysical environments, can now be replicated in the laboratory with the same means. Recent experimental results on Fe15+ and Fe16+ from the Linac Coherent Light Source (LCLS) at SLAC and the synchrotron BESSY II will be presented. The data help to solve open astrophysical questions related to the plasma dynamics in X-ray binaries. |
| Date: | Tue, 08.11.2011 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Ao.Univ.Prof. Dr. Friedrich Aumayr |
| g-2 and ∆α (M_Z^2): touchstone of the Standard Model, keyhole to New Physics? |
| Speaker: | Thomas Teubner (Liverpool Univ.) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 08.11.2011 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | A. Hoang, H. Neufeld |
| Inequalities between area, angular momentum, charge and the cosmological constant for marginally trapped surfaces” |
| Speaker: | Walter SIMON (Univ.Wien) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 10.11.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | R. Beig |
| Obtaining weak and other eccentric values with non-ideal measurements |
| Speaker: | Alex MATZKIN (CNRS/Univ. Cergy-Pontoise, Paris) |
| Date: | Fri, 11.11.2011 |
| Time: | 15:30 |
| Location: | Hörsaal Atominstitut, Stadionallee 2, 1020 Wien |
| Contact: | Y. Hasegawa |
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