Winding up superfluid in a torus via Bose Einstein condensation

[摘要] We simulate Bose-Einstein condensation at finite temperature in a ring employing stochastic Gross-Pitaevskii equation and show that cooling through the critical point can generate topologically stable quantized circulation of the newborn condensate around the ring. The resulting winding numbers exhibiting Gaussian distribution with dispersion following scaling behavior predicted by the Kibble-Zurek mechanism (KZM). This opens up possibilities for direct experimental study of the underlying phase transition and the basic principles of KZM extended to account for such circulations. We discuss the effect of inhomogeneity on the above phenomenon by considering the effect of tilting of the ring in the gravitational field.

[发布日期] 2010-12-16

[学科分类] 凝聚态物理

[关键词] BOSE-EINSTEIN CONDENSATION;CONDENSATES;DISTRIBUTION;GRAVITATIONAL FIELDS