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Calendar of Physics Talks Vienna
| Schrödinger's chip: Designs for solid state quantum processors using electron spins |
| Speaker: | Charles MARCUS (Harvard University, Cambridge) |
| Abstract: | Schrödinger’s cat, half-alive, half-dead, existing in its sealed box in this dual state, illustrates the counterintuitive role of measurement in quantum mechanics, but also how the preservation of quantum properties, which dominate at atomic scales (even at room temperature), become less familiar and even absurd for large multi-particle objects. Building computer chips that can take advantage of quantum coherence and entanglement to allow improvements in computation and simulation is much like the challenge of trying to build Schrödinger's cat, using components that operate near absolute zero. This talk will review progress toward this endeavor, and the interesting new physics that arises in fighting decoherence in solid-state systems. |
| Date: | Mon, 19.04.2010 |
| Time: | 17:30 |
| Location: | TU Wien Freihaus, Hörsaal 5, 2. Stock (grüner Bereich), Wiedner Hauptstr. 8, 1040 Wien |
| Contact: | H.-J. Schmiedmayer |
| Interacting galaxies - numerical simulations in astrophysics |
| Speaker: | Adam Ruzicka (University of Vienna) |
| Abstract: | Galaxies are considered the building blocks of the Universe. They are gravitationally bound systems of stars and gas. However, their kinematics cannot be explained within the framework of the classical Newtonian/Einstein theories of gravity unless additional mass is introduced. The visible matter corresponds to 10% of the mass needed to explain the formation and evolution of galaxies. To resolve the difficulty, the standard cosmology introduces the mysterious invisible dark matter. This matter does not interact in any way but gravitationally. The visible galactic matter resides in the centers of extended dark matter structures - galactic halos. Already few hundred milion years after the Big Bang the clustering of the dark matter gave rise to the first dark matter halos. Theis mass was increasing due to the hierarchical merging of smaller structures. Later, the visible (baryonic) matter cooled down and seetled down in the centers of the dark matter halos. The first galaxies appeared. The structure of the Universe seems hierarchical on all scales, and galaxies have formed a large variety of groups as well. Apparently, galaxies must interact, and their encounters or even mergers influence critically their evolution. Numerical simulations and the computational astrophysics are nowadays the most powerful tools to learn what is behind the remarkable variety of galaxies. However, once observational data are available for a galactic system, they put a number of constraints on every theoretical model of such a system regarding the choice for the right combination of the initial conditions in order to reproduce the observations. Astrophysicists are forced to deal with extended sets of model parameters and initial conditions. We have shown that such high-dimensional parameter spaces may be searched through on a reasonable time-scale if a simplified astrophysical model of the galactic interaction is employed in a combination with an automated evolutionary code looking for the optimal solution to a problem. I will present our approach to modeling galactic interactions based on the use of genetic algorithms.
Lunch Club
Overview |
| Date: | Tue, 20.04.2010 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room |
| Contact: | Theo Adaktylos, David Burke, Andreas Gabriel, Niklas Johansson & Christoph Spengler |
| Modulare Lokalisierung in der Quantenfeldtheorie |
| Speaker: | Sabina Alazzawi (Univ. Wien) (Fakultät für Physik) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 20.04.2010 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Erwin-Schrödinger Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | J. Yngvason |
| Surface Science Investigations of Metal Oxides: Applications, Fundamentals and Insights |
| Speaker: | Prof. Dr. Ulrike Diebold (TU Wien, Institut für Angewandte Physik) |
| Abstract: | Metal oxides exhibit an extremely wide variety in their physical and chemical
properties, which makes them useful in a large number of technological
applications. In many of these technical fields surface and interface properties play
a dominant role. Our research focuses on investigating the fundamental properties
of metal oxide surfaces using a combination of surface spectroscopies and
Scanning Tunneling Microscopy with atomic resolution.
In the talk I will discuss selected examples of recent research results, with
particular emphasis on the role of hydrogen on the electronic structure [1], reactivity
[2], and diffusion processes [3] on metal oxide surfaces.
[1] Gareth Parkinson, Narasimham Mulakaluri, Yaroslav Losovji, Peter Jacobson, Rossitza Pentcheva
Ulrike Diebold “Adsorption-Induced Half-Metallicity at the Magnetite (001) Surface”, submitted
[2] S.-C. Li and Ulrike Diebold “Reactivity of TiO2 Rutile and Anatase Surfaces towards Nitroaromatics
of the American Chemical Society, 132 (2010) 64 – 66
[3] Shaochun Li, U. Diebold, Li-Na Chu, and Xue-Qing Gong “Hydrogen controls the dynamics of
catechol adsorbed on a TiO2(110) surface” Science, in press |
| Date: | Wed, 21.04.2010 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Festkörperphysik, SEM 138B, 7.OG/C, Wiedner Hauptstrasse 8-10, 1040 Wien |
| Contact: | Ao.Univ.Prof. Dr. Herbert Störi, Prof. Dr. K. Held |
| Surface Science Investigations of Metal Oxides: Applications, Fundamentals and Insights |
| Speaker: | Ulrike Diebold (IAP) |
| Abstract: | Metal oxides exhibit an extremely wide variety in their physical and chemical
properties, which makes them useful in a large number of technological
applications. In many of these technical fields surface and interface properties play
a dominant role. Our research focuses on investigating the fundamental properties
of metal oxide surfaces using a combination of surface spectroscopies and
Scanning Tunneling Microscopy with atomic resolution.
In the talk I will discuss selected examples of recent research results, with
particular emphasis on the role of hydrogen on the electronic structure [1], reactivity
[2], and diffusion processes [3] on metal oxide surfaces.
[1] Gareth Parkinson, Narasimham Mulakaluri, Yaroslav Losovji, Peter Jacobson, Rossitza Pentcheva
Ulrike Diebold “Adsorption-Induced Half-Metallicity at the Magnetite (001) Surface”, submitted
[2] S.-C. Li and Ulrike Diebold “Reactivity of TiO2 Rutile and Anatase Surfaces towards Nitroaromatics
of the American Chemical Society, 132 (2010) 64 – 66
[3] Shaochun Li, U. Diebold, Li-Na Chu, and Xue-Qing Gong “Hydrogen controls the dynamics of
catechol adsorbed on a TiO2(110) surface” Science, in press |
| Date: | Wed, 21.04.2010 |
| Time: | 16:00 |
| Duration: | 45 min |
| Location: | Seminarraum 138B, 7. OG, Turm C (rot) |
| Contact: | Karsten Held |
| Fermions in noncommutative emergent gravity |
| Speaker: | Mag. Daniela Klammer (Univ. Wien) (Fakultät für Physik) |
| Abstract: | Seminar |
| Date: | Thu, 22.04.2010 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | Harald Grosse |
| Stochastic Population Dynamics in Astrochemistry and Aerosol Science |
| Speaker: | Christiane Losert-Valiente Kroon (ESI, Wien) (Fakultät für Physik und Medizinische Univ. Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Uni Wien) und "Analyse Komplexer Systeme" (Med.Uni Wien) |
| Date: | Fri, 23.04.2010 |
| Time: | 14:30 |
| Duration: | 90 min |
| Location: | Med.Univ., Bibliothek |
| Contact: | H. Hüffel |
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