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Calendar of Physics Talks Vienna
| Structure and dynamics of simple metal clusters |
| Speaker: | Bernd von Issendorff (University of Vienna) |
| Abstract: | Clusters and nanoparticles often have properties rather different to those of the corresponding bulk material, which is due to the large surface-to-volume ratio and in general to quantum size effects, the discretization of otherwise continuous densities of states. Especially the latter effect makes them highly interesting candidates for the study of few to many particle physics.
In my talk I will first explain the intricate interplay between electronic and geometric structure in simple metal clusters, which has been clarified by a combination of photoelectron spectroscopy on free, size-selected alkali and noble metal clusters and DFT-calculations. Then I will concentrate on two examples of recent findings. |
| Date: | Mon, 04.10.2021 |
| Time: | 15:00 |
| Location: | Ernst-Mach-Hörsaal, 2nd floor, Boltzmanngasse 5 |
| Contact: | Markus Arndt |
| Quantum oscillations in electrically and microwave driven 2D materials |
| Speaker: | Ivan Dmitriev (THz-Zentrum, University of Regensburg, Germany ) |
| Abstract: | I will present an overview of quantum transport phenomena which emerge in moderate magnetic fields in various high-mobility 2D electron systems (2DES) including GaAs/AlGaAs, ZnO/MnZno, and Si/Ge heterostructures, electrons on surface of liquid He, graphene, and surface states of topological insulators.
These phenomena include famous microwave induced resistance oscillations (MIRO) which can be so strong that the total dc conductivity of the system turns negative leading to a zero resistance state (ZRS) with spontaneously formed electric field domains.
After an overview of experimental results, I will present a simple perturbative kinetic description of these phenomena and demonstrate deep links between them.
Finally, I will address recent experiments conducted in TU Wien which shed light on the polarization immunity paradox of MIRO and which sharply contrast the previous findings. |
| Date: | Wed, 06.10.2021 |
| Time: | 16:00 |
| Duration: | 45 min |
| Location: | Freihaus, Seminarraum DB gelb 09 (gelber Bereich, 9. OG) |
| Contact: | Andrei Pimenov |
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