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Q: Fachverband Quantenoptik und Photonik
Q 17: Fermi Quantum Gas
Q 17.9: Vortrag
Dienstag, 15. März 2011, 12:30–12:45, BAR Schön
Far-From-Equilibrium Dynamics of Ultracold Fermi Gases — •Matthias Kronenwett1,2, Sebastian Bock1,2, and Thomas Gasenzer1,2 — 1Institut für theoretische Physik, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt
Equilibration of an isolated Fermi gas in one spatial dimension after an interaction quench is studied. Evaluating Kadanoff-Baym dynamic equations for correlation functions obtained from the two-particle-irreducible effective action in nonperturbative approximation, the gas is seen to evolve to states characterized by thermal as well as nonthermal momentum distributions, depending on the assumed initial conditions. At sufficiently low total energies a violation of the fluctuation-dissipation relation in the tail of the Fermi-Dirac distribution indicates equilibration to a nonthermal state.