corner
corner
APS » Journals » Phys. Rev. A » Volume 57 » Issue 1
< Previous Article | Next Article >

Phys. Rev. A 57, R32–R35 (1998)

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

Download: PDF (100 kB) Buy this article Export: BibTeX or EndNote (RIS)

R. J. Dodd*
Institute for Physical Science and Technology, University of Maryland at College Park, College Park, Maryland 20742

Mark Edwards*
Department of Physics, Georgia Southern University, Statesboro, Georgia 30460-8031

Charles W. Clark
Electron and Optical Physics Division, Physics Laboratory, National Institute of Standards and Technology, Technology Administration, U. S. Department of Commerce, Gaithersburg, Maryland 20899-0001

K. Burnett*
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom

Received 19 March 1997; published in the issue dated January 1998

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 87Rb 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.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.57.R32
DOI:
10.1103/PhysRevA.57.R32
PACS:
03.75.Fi, 67.40.Db, 67.90.+z

*Also at Physics Laboratory, National Institute of Standards and Technology, Technology Administration, U.S. Department of Commerce, Gaithersburg, MD 20899.

 
< Previous Article | Next Article >