Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 49: Stark korrelierte atomare Systeme

Q 49.2: Talk

Tuesday, March 8, 2005, 17:15–17:30, HU Kinosaal

Exact time evolution of ultracold atomic gases in modulated optical lattices — •Markus Hild, Felix Schmitt, and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

We study the time evolution of interacting Bose gases and Fermi/Fermi-mixtures in an one-dimensional optical lattice in the framework of the time-dependent Bose- and Fermi-Hubbard-model. We compute the exact time evolution of the system to simulate its dynamic behaviour under temporal and spatial perturbations. As in the experiment by Stöferle et. al. [Phys. Rev. Lett. 92, 130403 (2004)] we can, e.g., modulate the depth of the lattice potential. We discuss the evolution of observables like mean occupation number, number variance and energy transfer over a wide range of interaction strengths to examine the behaviour of such systems especially in the regime of the quantum phase transitions. Our results for Bose gases are in good qualitative agreement with the recent experimental data. The calculations on Fermi/Fermi-mixtures provide valuable information for future experiments.