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Calendar of Physics Talks Vienna
| Ab-initio electron dynamics simulation for attosecond physics in solids |
| Speaker: | Shunsuke A. Sato (Center for Computational Sciences, University of Tsukuba) |
| Abstract: | Thanks to the rapid progress of the laser technologies, ultrafast electron dynamics in atoms and molecules have been investigated in time-domain with attosecond time resolution. Recently, the attosecond observation technique has been further applied to solid-state materials, and nonequilibrium electron dynamics in solids have been studies. While such attosecond experiments provide a wealth of microscopic information on nonequilibrium dynamics, the experimental results are often complicated and hard to directly interpret.
The first-principles calculation based on the time-dependent density functional theory is a powerful tool to describe such complex nonlinear electron dynamics and to provide microscopic insight into the phenomena.
In this talk, I will present our recent applications of the first-principles electron dynamics simulations to attosecond experiments for GaAs [1] and … |
| Date: | Mon, 05.08.2019 |
| Time: | 15:00 |
| Location: | Seminar room FH gelb 10, Institute for Theoretical Physics – Vienna University of Technology, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower) |
| Contact: | Joachim Burgdörfer |
| Surprises in Casimir Physics |
| Speaker: | Ulf Leonhardt (Weizmann Institute of Science, Israel) |
| Abstract: | In 1948 Casimir discovered that the quantum vacuum may exert a force on macroscopic bodies - two mirrors attract each other in complete vacuum. Around 1960 Lifshitz, Dzyaloshinskii and Pitaevskii generalized the theory of the Casimir effect to bodies of arbitrary shape and dielectric response. Since 1997 high-precision experiments appeared that agree with modern computational versions of Lifshitz’ theory to an accuracy only limited by the knowledge of the dielectric properties of the bodies involved. The Casimir effect is well understood. Or is it? The Casimir force between macroscopic bodies is well understood, but not the force inside bodies. One example is the Casimir stress of a sphere onto itself - a problem Schwinger and his postdocs attempted to solve about 40 years ago, but gave up. Not much progress has been made since then. The seminar discusses these problems and our steps towards their solutions. Be prepared for surprises. |
| Date: | Thu, 08.08.2019 |
| Time: | 15:00 |
| Location: | Atominstitut, Seminarraum, Stadionallee 2, Wien 2 |
| Contact: | H. Abele |
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