Collective excitations of Bose-Einstein condensed gases at finite temperatures

Details Collective excitations of Bose-Einstein condensed gases at finite temperatures Collective excitations of Bose-Einstein condensed gases at finite temperatures

1997-08-19

arxiv.org/abs/cond-mat/9708139v1

Physics

Condensed Matter

4 pages, Latex, with 4 figures. More info at http://amo.phy.gasou.edu/bec.html

Scientific paper

10.1103/PhysRevA.57.R32

We have applied the Popov version of the Hartree-Fock-Bogoliubov (HFB) approximation to calculate the finite-temperature excitation spectrum of a Bose-Einstein condensate (BEC) of $^{87}$Rb atoms. For lower values of the temperature, we find excellent agreement with recently-published experimental data for the JILA TOP trap. In contrast to recent comparison of the results of HFB--Popov theory with experimental condensate fractions and specific heats, there is disagreement of the theoretical and recent experimental results near the BEC phase transition temperature.

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