M J Davis et al 1999 J. Phys. B: At. Mol. Opt. Phys. 32 3993 doi:10.1088/0953-4075/32/15/327
Effects of temperature upon the collapse of a Bose-Einstein condensate in a gas with attractive interactions
M J Davis
, D A W Hutchinson and E Zaremba
We present a study of the effects of temperature upon the excitation frequencies of a Bose-Einstein condensate formed within a dilute gas with a weak attractive, effective interaction between the atoms. We use the self-consistent Hartree-Fock Bogoliubov treatment within the Popov approximation, and we compare our results to previous zero-temperature and Hartree-Fock calculations. The metastability of the condensate is monitored by means of the l = 0 excitation frequency. As the number of atoms in the condensate is increased, with T held constant, this frequency goes to zero, signalling a phase transition to a dense collapsed state. The critical number for collapse is found to decrease as a function of temperature, the rate of decrease being greater than that obtained in previous Hartree-Fock calculations.
- PACS
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03.75.Hh Static properties of condensates; thermodynamical, statistical and structural properties
- Subjects
- Dates
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Issue 15 (14 August 1999)
Received 28 June 1999
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Effects of temperature upon the collapse of a Bose-Einstein condensate in a gas with attractive interactions
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