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Calendar of Physics Talks Vienna
| Trimers, molecules and polarons in polarized atomic Fermi gases |
| Speaker: | Meera Parish (Cavendish Laboratory, Cambridge) |
| Abstract: | In this talk, I will consider an atomic Fermi gas in the limit of extreme spin imbalance, where one has a single spin-down impurity atom interacting attractively with a spin-up atomic Fermi gas. By constructing variational wave functions for polarons, molecules and trimers, I will explore the quantum phase transitions between each of these bound states as a function of mass ratio and interaction strength. I will show that the p-wave trimer can in fact be stabilised by the presence of the Fermi sea, much like the situation in the Cooper pair problem. Finally, I will discuss how these transitions might be observed in cold-atom experiments. Lunch Club Overview |
| Date: | Tue, 25.01.2011 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Niklas Johansson |
| Speaker: | Kurt Fritz und Harald Ringbauer |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 25.01.2011 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | J. Yngvason |
| High quality pentacene thin films by supersonic molecular beam deposition |
| Speaker: | Petra Rudolf (Zernike Institute of Advanced Materials, University of Groningen, The Netherlands) |
| Abstract: | In recent years, organic transistors have been attracting considerable attention because of their unique natures such as mechanical flexibility, low process costs and easiness of a large-area fabrication. However, due to the lower mobility of organic semiconductors, the performance of organic transistors is in general inferior to that of the inorganic ones. We adopted supersonic molecular beam deposition (SuMBD) to control the quality of thin film growth to investigate the relationship between the structure and electronic/electrical properties of small-molecule high-mobility organic semiconductor thin films, such as pentacene The morphology and crytallinity in the SuMBD grown pentacene first monolayer on the SiO2 surface can in fact be controlled by the kinetic energy and the momentum of the impinging molecules.
In this talk, I shall emphasizes the significant differences between pentacene (sub-)monolayer growth by the thermal sublimation and by SuMBD. By using transverse shear microcopy, we demonstrate that islands grown by SuMBD are single crystalline while those deposited by thermal sublimation have a polycrystalline structure. Very large single crystal grains (~ 10microm) can be obtained in pentacene monolayers growth with Ek=6.4 eV. First results on top as well as bottom contact OFETs with SuMBD deposited pentacene films will be discussed.
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| Date: | Tue, 25.01.2011 |
| 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: | Univ.Prof. Dr. Ulrike Diebold |
| Speaker: | Univ.-Prof. Piotr T. Chrusciel (Univ. Wien) (Fakultät für Physik) |
| Abstract: | Antrittsvorlesung |
| Date: | Wed, 26.01.2011 |
| Time: | 17:00 |
| Duration: | 90 min |
| Location: | Großer Festsaal der Universität Wien, Dr. Karl-Lueger-Ring 1, 1. Stock |
| Contact: | P. T. Chrusciel |
| Neutrinos from neutralino annihilation in the Sun |
| Speaker: | Vassilis Spanos (NCSR Demokritos, Athens ) |
| Abstract: | We will discuss the neutrino fluxes from neutralino LSP annihilations inside the Sun, in the context of various supersymmetric models, like the Constrained Minimal Supersymmetric Standard Model (CMSSM) and the Non-Universal Higgs supersymmetric Model (NUHM). We will show that there are large regions of typical CMSSM and NUHM parameter space where the LSP density inside the Sun is not in equilibrium, so that the annihilation rate may be far below the capture rate. Moreover, we will show that neutrino fluxes depend on the solar model and on the parameters of the spin-dependent and spin-independent neutralino-nucleus scattering. Scanning the cosmologically favoured parts of the parameter space, we will see that the IceCube/DeepCore detector can probe at best only parts of this parameter space. |
| Date: | Thu, 27.01.2011 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | HEPHY Bibliothek, Nikolsdorfergasse 18, 1050 Wien |
| Contact: | Helmut Eberl, HEPHY Vienna |
| Alpha_s from 5-jet cross sections |
| Speaker: | Rikkert Frederix (Univ. Zürich) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 27.01.2011 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Danger of Leverage in a World of Perfect Hedging |
| Speaker: | Sebastian Poledna (Med.Uni Wien) |
| Abstract: | Im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Uni Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien) |
| Date: | Fri, 28.01.2011 |
| Time: | 14:30 |
| Duration: | 90 min |
| Location: | Medizinische Univ., Seminarraum 513, Bauteil 88, |
| Contact: | H. Hüffel, Stefan Thurner |
| Erste Integrale aktiver Systeme |
| Speaker: | Maximilian Sadilek (Uni Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Uni Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien) |
| Date: | Fri, 28.01.2011 |
| Time: | 16:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | H. Hüffel, Stefan Thurner |
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