A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions

Details A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions

2007-05-09

arxiv.org/abs/0705.1226v1

Physical Review A 76 (16/07/2007) 013613

Physics

Condensed Matter

Other Condensed Matter

19 pages

Scientific paper

10.1103/PhysRevA.76.013613

We develop a semi-classical field method for the study of the weakly interacting Bose gas at finite temperature, which, contrarily to the usual classical field model, does not suffer from an ultraviolet cut-off dependence. We apply the method to the study of thermal vortices in spatially homogeneous, two-dimensional systems. We present numerical results for the vortex density and the vortex pair distribution function. Insight in the physics of the system is obtained by comparing the numerical results with the predictions of simple analytical models. In particular, we calculate the activation energy required to form a vortex pair at low temperature.

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