Finite temperature excitations of Bose gases in anisotropic traps

Details Finite temperature excitations of Bose gases in anisotropic traps Finite temperature excitations of Bose gases in anisotropic traps

1998-11-02

arxiv.org/abs/cond-mat/9811012v1

Physics

Condensed Matter

7 pages revtex, 7 figures in postscript

Scientific paper

10.1103/PhysRevA.59.3816

The mode frequencies of a weakly interacting Bose gas in a magnetic trap are studied as a function of the anisotropy of the trap. As in earlier works the generalized Hartree-Fock-Bogoliubov equations within the Popov approximation (HFB-Popov) are used for our calculations. The new feature of our work is the combined use of a mode expansion in a finite basis and a semiclassical approximation of the highly excited states. The results are applied to check the accuracy of the recently suggested equivalent zero-temperature condensate (EZC) approximation which involves a much simpler model.

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