Calendar of Physics Talks Vienna

Variable Flavor Number Scheme for Final State Jets in DIS
Speaker:Daniel Samitz (Univ. Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 06.10.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Black holes in the 1/D expansion
Speaker:Roberto Emparan (Barcelona U.)
Abstract:When the number of dimensions is very large, the gravitational field of a black hole is strongly localized near the horizon. Therefore in this limit the black hole can be effectively identified with a surface in an empty background geometry. The Einstein equations determine the effective equations that this 'black hole surface', or 'effective membrane', must satisfy. When the black hole is static, these are the same as the equations for soap films and can be solved for non-trivial black hole geometries in a simple way. For time-evolving black branes, the effective theory gives an enormous simplification over conventional methods, allowing to easily follow the evolution of the black brane instability to its endpoint.
Date: Thu, 08.10.2015
Time: 14:00
Duration: 60 min
Location:SEM 136, TU Wien, Freihaus, 10th floor (Wiedner Hauptstr. 8-10, A-1040 Vienna)
Contact:Daniel Grumiller

Transport in graphene nanostructrues - achievements and challenges
Speaker:Prof. Dr. Thomas Ihn (Nanophysics group, ETH Zürich)
Abstract:The isolation of single‐layer graphene by Geim and Novoselov in 2004 has sparked big hopes for realizing nano‐patterned coherent quantum devices with spin‐coherence times superior to the more established semiconducting materials. In this talk I will present a selection of state‐of‐the‐art experiments with graphene quantum devices, which give insights into the achievements of the past ten years and show the challenges for future graphene nanostructures. We will discuss new experiments on a stacked van‐der Waals heterostructure device with integrated lateral confinement, which show phenomena that have been labeled "mesoscopic Coulomb drag" and exhibit "broken detailed balance". We will further see how improved material quality leads to the observation of a Lifshitz transition, and to Fabry‐Perot interference in bilayer graphene.
Date: Thu, 08.10.2015
Time: 16:30
Location:Seminar room DB gelb 10 (SEM-136), Institute for Theoretical Physics – TU Wien, Wiedner Hauptstr. 8–10, 10th floor, B (yellow tower)
Contact:Dr. Florian Libisch

Single shot simulations of dynamic quantum manybody systems
Speaker:Kaspar Sakmann
Abstract:Single experimental shots of ultracold quantum gases sample the many-particle probability distribution. In a few cases single shots could be successfully simulated from a given many-body wave function. However, for realistic time-dependent manybody dynamics this has long been elusive. Here, we show how single shots can be simulated from numerical solutions of the time-dependent many-body Schrödinger equation. We provide first principle explanations for fluctuations in the collision of attractive Bose-Einstein condensates (BECs), for the appearance of randomly fluctuating vortices and for the center of mass fluctuations of attractive BECs in a harmonic trap. We also show how single shot simulations provide full counting distributions and correlation functions of any order. The described method is broadly applicable to many-body systems whose phenomenology is driven by information beyond what is typically available in low-order correlation functions.
Date: Fri, 09.10.2015
Time: 15:30
Location:Atominstitut, Hörsaal, Stadionallee 2, Wien 2
Contact:J. Schmiedmayer