Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-08-28
Physics
Condensed Matter
Statistical Mechanics
17 pages, 6 figures, submitted to the Proceedings of the 11th International Laser Physics Workshop 2002
Scientific paper
We discuss the collective modes in a harmonically trapped, highly-elongated Bose condensed gas. The transverse breathing mode exhibits a number of interesting features, such as the insensitivity of the condensate mode frequency to the interaction strength, and the closeness of the frequency to that of the non-condensed thermal cloud in the collisionless limit. Using finite temperature simulations, we show that these features are responsible for the very small damping rate observed experimentally. Our results for the temperature dependence of the damping rate and frequency shift are in excellent agreement with experiment. We also demonstrate that the unusually small damping rate does not arise for the $m=2$ mode or for more isotropic trap potentials, suggesting further possible experimental tests of our theory.
Jackson Bailey
Zaremba E.
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