Winding up superfluid in a torus via Bose Einstein condensation
  We simulate Bose-Einstein condensation (BEC) in a ring employing stochastic Gross-Pitaevskii equation and show that cooling through the critical temperature can generate spontaneous quantized circulation around the ring of the newborn condensate. Dispersion of the resulting winding numbers follows scaling law predicted by the Kibble-Zurek mechanism (KZM). Density growth also exhibits scaling behavior consistent with KZM. This paves a way towards experimental verification of KZM scalings, and experimental determination of critical exponents for the BEC transition. 
Arnab Das, Jacopo Sabbatini and Wojciech H. Zurek
cond-mat.other cond-mat.quant-gas hep-ph quant-ph