Finite temperature excitations of a trapped Bose gas

Details Finite temperature excitations of a trapped Bose gas Finite temperature excitations of a trapped Bose gas

1996-11-04

arxiv.org/abs/cond-mat/9611023v1

Physics

Condensed Matter

4 pages, Latex, 4 postscript figures. Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.78.1842

We present a detailed study of the temperature dependence of the condensate and noncondensate density profiles of a Bose-condensed gas in a parabolic trap. These quantitites are calculated self-consistently using the Hartree-Fock-Bogoliubov equations within the Popov approximation. Below the Bose-Einstein transition the excitation frequencies have a realtively weak temperature dependence even though the condensate is strongly depleted. As the condensate density goes to zero through the transition, the excitation frequencies are strongly affected and approach the frequencies of a noninteracting gas in the high temperature limit.

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