Excitation and damping of collective modes of a Bose-Einstein condensate in a one-dimensional lattice

Details Excitation and damping of collective modes of a Bose-Einstein condensate in a one-dimensional lattice Excitation and damping of collective modes of a Bose-Einstein condensate in a one-dimensional lattice

2002-08-08

arxiv.org/abs/cond-mat/0208162v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages; submitted to PRA

Scientific paper

10.1103/PhysRevA.67.031603

The mode structure of a Bose-Einstein condensate non-adiabatically loaded into a one-dimensional optical lattice is studied by analyzing the visibility of the interference pattern as well as the radial profile of the condensate after a time-of-flight. A simple model is proposed that predicts the short-time decrease of the visibility as a function of the condensate parameters. In the radial direction, heavily damped oscillations are observed, as well as an increase in the condensate temperature. These findings are interpreted as a re-thermalization due to dissipation of the initial condensate excitations into high-lying modes.

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