Calendar of Physics Talks Vienna

Single spins in self-assembled quantum dots
Speaker:Richard J. Warburton (Heriot-Watt University, Edinburgh)
Abstract:In the search for a single, coherent quantum state in a semiconductor, spin is a natural choice as spin interacts only indirectly with the usual source of dephasing, the phonons. Experiments will be presented first on a single electron confined to a quantum dot showing how the electron spin dephasing via the phonons is highly suppressed. However, the experiments show that fixing one problem creates another: the electron spin rapidly loses its coherence via an interaction with the nuclear spins in the quantum dot. In an attempt to bypass this problem, experiments will be presented also on a single hole spin. Remarkably, with unprepared nuclear spins, the experiments demonstrate that a hole spin is much more coherent than an electron spin. Further progress in this field demands new levels of experimental control. Recent progress in GHz bandwidth switching and microcavity development will be mentioned.
Date: Mon, 11.01.2010
Time: 17:30
Duration: 60 min
Location:Christian-Doppler Hörsaal, Boltzmanngasse 5, 3rd floor, 1090 Wien
Contact:Prof. Karl Unterrainer, TU Wien

Vienna Theory Lunch Club - Local Hamiltonians- finding ground states in quantum computation.
Speaker:Daniel Nagaj (RCQI Bratislava)
Abstract:Overview Lunch Seminar
Date: Tue, 12.01.2010
Time: 12:30
Duration: 60 min
Location:University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room
Contact:Theo Adaktylos, Maximilian Attems, David Burke, Marcus Huber

Constraints on Particle Dark Matter
Speaker:Patrick Ludl (Univ.Wien) (Fakultät für Physik)
Abstract:im Rahmen des Teilchenphysik-Seminars
Date: Tue, 12.01.2010
Time: 16:15
Duration: 60 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:W. Grimus, H. Neufeld

Geometry and gravity from noncommutative gauge theory
Speaker:Harold Steinacker (Univ. Wien) (Fakultät für Physik)
Abstract:im Rahmen des Literaturseminars mathematische Physik: nichtkommutative Geometrie und strings
Date: Thu, 14.01.2010
Time: 16:15
Duration: 60 min
Location:Erwin-Schrödinger Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Steinacker

Quantenaspekte aktiver Bewegung und anharmonische Effekte in Kristallen
Speaker:Maximilian Sadilek (Univ.Wien) (Fakultät für Physik )
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Univ.Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien)
Date: Fri, 15.01.2010
Time: 14:30
Duration: 90 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Hüffel