Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Gases: Interaction Effects I

Q 16.7: Talk

Tuesday, March 9, 2010, 15:45–16:00, E 001

Far-From-Equilibrium Dynamics of Ultracold Fermi Gases — •Matthias Kronenwett¹, Thomas Gasenzer¹, Michael Foss-Feig², and Ana Maria Rey² — ¹Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — ²JILA, University of Colorado, Boulder CO-80309, USA

We study the dynamics of ultracold Fermi gases far from thermal equilibrium. We employ a functional-integral approach based on the Schwinger-Keldysh closed time path integral 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 N, where N is the number of atomic hyperfine states. 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. We present results on the dynamics of a 1D Fermi gas initially prepared far away from equilibrium. We also demonstrate how this formalism is specially suited to describe far-from-equilibrium dynamics in a Kondo lattice of ultracold fermionic alkaline-earth atoms.