Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.6: Poster

Tuesday, March 11, 2008, 16:30–19:00, Poster C2

Far-From-Equilibrium Dynamics of an Ultracold Fermi Gas — •Matthias Kronenwett and Thomas Gasenzer — Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg

The dynamics of ultracold Fermi gases far from thermal equilibrium is studied. A functional-integral approach based on the Schwinger-Keldysh closed time path integral is employed to derive the two-particle irreducible (2PI) effective action. From this, the two-point correlation functions are determined self-consistently. The action is expanded in inverse powers of the number of field components N, and the dynamic equations are derived in next-to-leading order of this expansion. This approach reaches far beyond mean-field theory and includes quantum statistical aspects of equilibration dynamics. It enables to describe, e. g., the dynamical evolution of trapped Fermi gases in optical lattices, as well as the BEC-BCS crossover dynamics.