Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Quantengase (Wechselwirkungseffekte II / Spinorgase)

Q 63.4: Talk

Friday, March 14, 2008, 14:45–15:00, 3G/H

Far-from-equilibrium dynamics of ultracold Bose gases — •Philipp Struck and Thomas Gasenzer — Institute for Theoretical Physics, University of Heidelberg, Philosophenweg 16, 69120 Heidelberg

The dynamical evolution of a Bose-Einstein condensate trapped in a one-dimensional optical lattice is investigated in the framework of the Bose-Hubbard model. Of special interest is the far-from equilibrium evolution of a strongly interacting gas. Using functional integral techniques, the dynamic equations are derived from the two-particle-irreducible effective action expanded in inverse powers of the field components. This approach reaches far beyond the Hartree-Bogoliubov mean-field theory and Quantum Boltzmann approaches. Within this framework we investigate various configurations of one-dimensional lattices of particular interest for present experiments. This includes dipole oscillations of a condensate damped by the thermal cloud and squeezing of particle number fluctuations below the classical limit.