2012/08/31 by S. J. Rooney, T. W. Neely, B. P. Anderson +1
Physics and Astronomy · #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.88.063620
published as Phys. Rev. A 88, 063620 (2013) · v2: 7 pages, 3 figures, new experimental data and numerical simulations
arxiv created 2013/10/24 · arxiv updated 2014/05/08
Experimental stirring of a toroidally trapped Bose-Einstein condensate at high temperature generates a disordered array of quantum vortices that decays via thermal dissipation to form a macroscopic persistent current [T. W. Neely em et al. arXiv:1204.1102 (2012)]. We perform 3D numerical simulations of the experimental sequence within the Stochastic Projected Gross-Pitaevskii equation using ab initio determined reservoir parameters. We find that both damping and noise are essential for describing the dynamics of the high-temperature Bose field. The theory gives a quantitative account of the formation of a persistent current, with no fitted parameters.