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A: Fachverband Atomphysik

A 23: Poster II

A 23.41: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

Nonlinear dynamics of a driven ultracold Bose gas — •Holger Hauptmann, Sigmund Heller, and Walter T. Strunz — Institut für Theoretische Physik, Technische Universität Dresden, Deutschland

We investigate collective modes of ultracold interacting Bose gases in a harmonic potential with a periodic time-dependent perturbation. Comparisons between the full numerics of the Gross-Pitaevskii equation and analytical approximations for the width of the gas cloud are presented. These are valid either in the Thomas-Fermi limit or near the ideal gas limit. For long time propagation the existence of a saddle point of the stroboscopic map in phase space leads to rich and unexpected dynamics.