Temperature dependence of the energy of a vortex in a two-dimensional Bose gas

Details Temperature dependence of the energy of a vortex in a two-dimensional Bose gas Temperature dependence of the energy of a vortex in a two-dimensional Bose gas

2004-08-30

arxiv.org/abs/cond-mat/0408652v1

Phys. Lett. A 328 (2004) 500

Physics

Condensed Matter

Other Condensed Matter

9 pages, 4 figures

Scientific paper

10.1016/j.physleta.2004.06.068

We evaluate the thermodynamic critical angular velocity Omega_c(T) for creation of a vortex of lowest quantized angular momentum in a strictly two-dimensional Bose gas at temperature T, using a mean-field two-fluid model for the condensate and the thermal cloud. Our results show that (i) a Thomas-Fermi description of the condensate badly fails in predicting the particle density profiles and the energy of the vortex as functions of T; and (ii) an extrapolation of a simple Thomas-Fermi formula for Omega_c(0) is nevertheless approximately useful up to T = 0.5 T_c.

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