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

R. J. Dodd; Mark Edwards; Charles W. Clark; K. Burnett

doi:10.1103/PhysRevA.57.R32

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

R. J. Dodd, Mark Edwards, Charles W. Clark, K. Burnett

Biochemistry, Chemistry & Physics

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140 Scopus citations

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 [Formula Presented] atoms. For lower values of the temperature, we find excellent agreement with recently published experimental data for the JILA time-averaged orbiting potential 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.

Original language	English
Pages (from-to)	R32-R35
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	57
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.57.R32
State	Published - 1998

Scopus Subject Areas

Atomic and Molecular Physics, and Optics

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10.1103/PhysRevA.57.R32

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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 [Formula Presented] atoms. For lower values of the temperature, we find excellent agreement with recently published experimental data for the JILA time-averaged orbiting potential 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.",

author = "Dodd, {R. J.} and Mark Edwards and Clark, {Charles W.} and K. Burnett",

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AU - Clark, Charles W.

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AB - 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 [Formula Presented] atoms. For lower values of the temperature, we find excellent agreement with recently published experimental data for the JILA time-averaged orbiting potential 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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Collective excitations of Bose-Einstein-condensed gases at finite temperatures

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