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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Electrons: Low-Dimensional Systems - Models 1

TT 3.10: Talk

Monday, March 11, 2013, 12:00–12:15, H9

Shear viscosity in a two-dimensional Fermi gas — •Carolin Küppersbusch¹, Tilman Enss², and Lars Fritz¹ — ¹Institut für Theoretische Physik, Universität zu Köln — ²Physik Department, Technische Universität München

We consider a two-component, two-dimensional, interacting Fermi gas which is experimentally realized in ultra cold atomic systems. An experimentally accessible quantity that has received a lot of interest recently as a measure of the interaction strength is the shear viscosity. This quantity describes the resistance of the system towards establishing a flow gradient and is lowest for strongly interacting systems. Using a Boltzmann equation we calculate the viscosity in all temperature and interaction ranges. In contrast to earlier studies we include medium scattering which lowers the viscosity by a factor of about three.