CPT

Calendar of Physics Talks Vienna

Hamilton-Jacobi formalism for singular systems
Speaker:Mario Bertin (Universidade Federal do ABC)
Abstract:In this talk it will be shown how the construction of Carathéodory's complete figure of variational calculus, which culminates in the Hamilton-Jacobi theory, provides an adequate theoretical background to analyze systems with constraints. Initial focus will be the analysis of integrability, which can be seen as the constraint analysis itself. Other special features, such as the construction of symplectic structures, infinitesimal canonical transformations, and gauge transformations will be addressed as well.
Date: Tue, 20.03.2012
Time: 12:30
Duration: 60 min
Location:University of Vienna, Institute for Theoretical Physics, Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room
Contact:Vienna Theory Lunch Seminar (http://www.univie.ac.at/lunch-seminar/index.htm)

Applications of Reflection Positivity: Graphene and other Examples
Speaker:Prof. Elliott LIEB (Princeton Univ.)
Abstract:Stability of Matter revisited
Date: Tue, 20.03.2012
Time: 14:15
Duration: 90 min
Location:Boltzmann Lecture Hall (ESI, Boltzmanngasse 9, 2. Stock)
Contact:Jakob Yngvason

Mechanism and applications of Diffuse Coplanar Surface Barrier Discharge
Speaker:Prof. Mirko Černák (Department of Physical Electronics, Masaryk University Brno, Czech Republic)
Abstract:In a contrast to common plasma applications for surface modifications of high-added value materials for microelectronics, medicine, etc. a novel type of atmospheric plasma source based on the Diffuse Coplanar Surface Barrier Discharge (DCSBD) developed at Masaryk University, Brno and Comenius University, Bratislava makes possible low-cost in-line treatment of a wide scale of standard flat and web materials. Advantageously in comparison to competitive plasma techniques this plasma source is capable of generating visually uniform “cold” high-power-density diffuse plasmas in any working gas, including ambient air and atmospheric-pressure oxygen, without the use of He or Ar. Very high plasma power densities achieved (~100 W/cm3) allows for short plasma exposure times on the order of 0.1 s and, consequently, high treatment speeds. In the talk the basic physical mechanism of DCSBD and results on in-line air-plasma polypropylene fabrics activation, inorganic nanofibers calcination, glass, ITO and Al surface cleaning, and other applications will be discussed.
Date: Tue, 20.03.2012
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Herbert Störi

Ice structures, patterns, and processes: A view across the ice-fields
Speaker:Ao. Univ.-Prof. Dr. Hinrich Grothe
Abstract:Ice is indeed all around us. As the cryosphere, ice or snow covers a small but significant part of the Earth’s surface, both land and sea, and it plays a similarly important role in our atmosphere. Moreover ice is present on many other celestial bodies in our solar system and — surely — beyond, and it coats grains of dust in interstellar space. Ice is not a static medium but a dynamical one; it shows strong variations of its characteristics with time and place, as we may readily experience at a human scale on any ski slope. A better understanding of ice structures, patterns, and processes is thus a topic of current research in physics and chemistry. This talk shall illustrate how progress in understanding these questions is elemental in understanding current questions in astrophysics, atmospheric, cryospheric, and environmental science.
Date: Tue, 20.03.2012
Time: 17:30
Duration: 60 min
Location:Lise-Meitner Hörsaal, Universität Wien, 1090 Wien, Strudlhofgasse 4 / Boltzmanngasse 5, 1.Stock
Contact:christl.langstadlinger@univie.ac.at

Recent developments in 3-dimensional classical and quantum gravity
Speaker:Daniel Grumiller (TU Vienna)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 22.03.2012
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:R. Beig

Neutrino mass models and sizable Theta 13
Speaker:Christoph Luhn (Univ. Durham)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 22.03.2012
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:W. Grimus, P. Ludl

WISPs from strings
Speaker:Mark Goodsell (CERN)
Abstract:WISPs, specifically the axion, axion-like particles and hidden photons, are being searched for in a wide variety of experiments and astrophysical observations. I shall discuss a little about their phenomenology, before describing how they can be found in the LARGE volume scenario, and what can be predicted for their properties. For hidden U(1)s, heterotic orbifolds can also yield interesting models and I shall describe some recent work on these.
Date: Thu, 22.03.2012
Time: 16:00
Duration: 60 min
Location:Institut f. Theoret. Physik, TU Wien, SEM 136, Wiedner Hauptstr., 10th floor
Contact:Pascal Anastasopoulos

Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond
Speaker:Kouichi SEMBA (NTT Basic Research Laboratories, Kanagawa)
Abstract:Superconducting qubits are now considered one of the most promising systems for quantum information processing. However, the experimentally reported coherence times are likely to be insufficient for future large-scale quantum information processing. A natural solution to this problem is a dedicated engineered quantum memory based on atomic and molecular systems. The question of whether coherent quantum coupling is possible between such natural systems and a single macroscopic artificial atom itself has attracted considerable attention since the first demonstration of macroscopic quantum coherence in Josephson junction circuits. In this talk, I report evidence of coherent strong coupling between a single macroscopic superconducting artificial atom (a flux qubit) and an ensemble of electron spins in the form of nitrogen– vacancy (NV-) colour centres in diamond. Furthermore, we have observed coherent exchange of a single quantum of energy between a flux qubit and a macroscopic ensemble consisting of more than 3x10^7 such NV-centres. This provides a foundation for future quantum memories and hybrid devices coupling microwave and optical systems.
Date: Fri, 23.03.2012
Time: 15:30
Location:Hörsaal, TU Wien Atominstitut, Stadionallee 2, 1020 Wien
Contact:H.-J. Schmiedmayer