CPT

Calendar of Physics Talks Vienna

Defect engineering of 2D materials: From fundamental aspects to applications
Speaker:Marika Schleberger (Universität Duisburg-Essen, Faculty of Physics Duisburg, Germany)
Abstract:The exciting and often unusual properties of 2D materials are interesting from a basic research point of view but are also at the heart of many future applications. An important issue in this context are defects which will always be present in all 2D materials at finite temperatures and may affect the material properties in various ways. Because defects may be beneficial for certain applications or may even be a prerequisite for a given function, e.g. chemically active sites for catalysis or charge carrier traps in electronic devices, the development of efficient strategies for defect engineering has become indispensable. A standard tool in materials science to artificially introduce defects into solids in a controllable way is the use of ion beams. But their application to 2D materials offers both new challenges as well as opportunities some of which shall be discussed in this talk. T
Date: Tue, 09.01.2018
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03), 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof.Dr. Friedrich Aumayr

Perturbative Yang-Mills theory without Faddeev-Popov ghost fields
Speaker:Danijel Markovic (Univ. Wien)
Abstract:Im Rahmen des Teilchenphysikseminars: A modified Faddeev-Popov path integral density for the quantization of Yang-Mills theory in the Feynman gauge is discussed, where contributions of the Faddev-Popov ghost fields are replaced by multi-point gauge field interactions. An explicit calculation to O(g^2) shows the equivalence of the usual Faddeev-Popov scheme and its modified version.
Date: Tue, 09.01.2018
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Hüffel

Quantum mechanics and the covariance of physical laws in quantum reference frames
Speaker:Flaminia Giacomini (Vienna)
Abstract:In physics, every observation is made with respect to a frame of reference. Although reference frames are usually not considered as degrees of freedom, in all practical situations it is a physical system which constitutes a reference frame. Can a quantum system be considered as a reference frame and, if so, which description would it give of the world? The relational approach to physics suggests that all the features of a system —such as entanglement and superposition— are observer-dependent: what appears classical from our usual laboratory description might appear to be in a superposition, or entangled, from the point of view of such a quantum reference frame. In this work, we develop an operational framework for quantum theory to be applied within quantum reference frames. We find that, when reference frames are treated as quantum degrees of freedom, a more general transformation ..
Date: Thu, 11.01.2018
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel