Calendar of Physics Talks Vienna

Putting things on top of other things: fabrication and applications of Van Der Waals heterostructures
Speaker:James HONE (Dept. of Mechanical Engineering, Columbia University)
Abstract:Two-dimensional materials such as graphene can achieve spectacular performance but are highly sensitive to disorder from the environment. We have developed techniques to controllably ‘stack’ graphene on insulating hexagonal boron nitride, which dramatically reduces disorder and increases performance. In addition, these heterostructures can display novel behavior due to the presence of ‘superlattice’ potentials arising from the graphene-BN stacking. In recent work, we have extended these techniques to create fully encapsulated devices whose performance approaches the ideal behavior of sgraphene. These techniques can be used to create heterostructures of other 2D materials such as MoS2 and WSe2. I will describe our studies of basic science and applications of these devices. About James Hone James Hone is currently Professor of Mechanical Engineering at Columbia University. He received his PhD in experimental condensed matter physics from UC Berkeley in 1998, and did postdoctoral work at the University of Pennsylvania and Caltech, where he was a Millikan Fellow. He joined the Columbia faculty in 2003. His current research interests include synthesis, characterization, manipulation, and applications graphene, and other 2D materials; nanomechanical devices; and nano-biology.
Date: Mon, 17.03.2014
Time: 17:30
Location:Universität Wien, Lise Meitner Hörsaal, Boltzmanng. 5, 1090 Wien
Contact:T. Pichler

Soft Physics at the LHC: insights and challenges
Speaker:Torbjön Sjöstrand (Lund University)
Abstract:Im Rahmen des Teilchenphysikseminars
Date: Tue, 18.03.2014
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, V. Mateu

The decay of solutions of the linear wave equation on flat spacetime
Speaker:Jérémie Joudioux (University of Vienna, Physics)
Abstract:The purpose of the talk is to explain some basics methods used to study the asymptotic properties of solutions of the linear wave equation on the flat space- time. The vector field method, which relies on the geometric structure of the equation, will be explained, and then used to derive conservations of energy for solutions of the wave equation. Then, the Klainerman-Sobolev inequalities will be derived, so that the asymptotic behavior of solutions of the wave equation can be described in detail. Finally, we will discuss the obstacles to the generalization of these results on black hole backgrounds.
Date: Thu, 20.03.2014
Time: 10:30
Duration: 60 min
Location:Faculty of Mathematics, University of Vienna, Besprechungszimmer 3 (3rd floor)
Contact:M. Bauer (UV), V. Branding (TU), A. Burtscher (UV), D. Fajman (UV), F. Genoud (UV), J. Joudioux (UV)

Open String Field Theory: charting the BCFT landscape
Speaker:Martin Schnabl (Prague, Inst. Phys.)
Abstract:Using the example of the critical Ising model, I will show how open string field theory is supposed to know about possible conformal boundary conditions in 2d CFTs.
Date: Thu, 20.03.2014
Time: 16:00
Duration: 60 min
Location:SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology
Contact:Daniel Grumiller and Johanna Knapp