Analytical description of a trapped semi-ideal Bose gas at finite temperature

Details Analytical description of a trapped semi-ideal Bose gas at finite temperature Analytical description of a trapped semi-ideal Bose gas at finite temperature

1998-03-18

arxiv.org/abs/cond-mat/9803216v1

Physics

Condensed Matter

4 pages, RevTeX, 3 figures

Scientific paper

10.1103/PhysRevA.58.2423

Present experiments with Bose condensed gases can be largely described by a semi-ideal two-gas model. In this model, the condensate is influenced only by the mean-field repulsion among condensed atoms, while the thermal cloud is considered an ideal gas confined by an effective potential that consists of the external trap and the mean-field repulsion by the condensate. This simple, intuitive model provides explicit analytical expressions for the density distributions of the condensate and the thermal component. It describes the reduction of the condensate fraction relative to that of an ideal gas as a consequence of the positive chemical potential due to interactions in the condensate.

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