Collective excitations of Bose-Einstein condensed gases at finite temperatures

Preprint

19 August 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9708139

Abstract

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.

Keywords

COLLECTIVE EXCITATIONS
FINITE TEMPERATURES
EINSTEIN CONDENSATE
PHASE TRANSITION
CONDENSED GASES
BOSE EINSTEIN
TEMPERATURE
POPOV

All Related Versions

Version 1, 1997-08-19, ArXiv
Published version: Physical Review A, 57 (1), R32.

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