A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions
Articolo
Data di Pubblicazione:
2007
Citazione:
A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions / L. Giorgetti, I. Carusotto, Y. Castin. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 76:1(2007), pp. 013613.013613.1-013613.013613.18. [10.1103/PhysRevA.76.013613]
Abstract:
We develop a semiclassical field method for the study of the weakly interacting Bose gas at finite temperature which, contrary to the usual classical field model, does not suffer from an ultraviolet cutoff 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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Boson systems ; vortices ; classical field theory
Elenco autori:
L. Giorgetti, I. Carusotto, Y. Castin
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