Journal
JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS
Volume 5, Issue 2, Pages S96-S102Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4266/5/2/364
Keywords
Bose-Einstein condensation; bosons; finite temperature; critical temperature; classical field; vortices
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We review our version of the classical field approximation to the dynamics of a finite-temperature Bose gas. In the case of a periodic box potential, we investigate the role of the high-momentum cut-off, essential in the method. In particular, we show that the cut-off going to the infinity limit describes the particle number going to infinity with the scattering length going to zero. In this weak-interaction limit, the relative population of the condensate tends to unity. We also show that the cross-over energy, at which the probability distribution of the condensate occupation changes its character, grows with a growing scattering length. In the more physical case of the condensate in the harmonic trap we investigate the dissipative dynamics of a vortex. We compare the decay time and the velocities of the vortex with the available analytic estimates.
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