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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.26: Poster

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

Dynamics of a low-dimension ultracold Bose gas — •Cédric Bodet and Thomas Gasenzer — Institüt für Theoretishe Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg

The dynamical evolution of a Bose-Einstein condensate trapped in a one-dimensional lattice potential is investigated theoretically in the framework of the Bose-Hubbard model. The emphasis is set on the far-from-equilibrium evolution in a case where the gas is strongly interacting. This is realized by an appropriate choice of the parameters in the Hamiltonian, and by starting with an initial state, where one lattice well contains a Bose-Einstein condensate while all other wells are empty. Oscillations of the condensate as well as non-condensate fractions of the gas between the different sites of the lattice are found to be damped as a consequence of the collisional interactions between the atoms. We approach this problem by numerically solving the Schrödinger equation for this model. We study in detail the particle number fluctuations on-site and between sites in order to investigate the conditions for producing squeezed states in experimentally realistic configurations.