Thermal activation of vortex-antivortex pairs in quasi-two-dimensional Bose-Einstein condensates.
Here we show, by performing ab initio classical field simulations that two distinct superfluid phases, separated by thermal vortex-antivortex pair creation, exist in experimentally producible quasi-2D Bose gas. These results resolve the debate on the nature of the low temperature phase(s) of a trapped interacting 2D Bose gas.
Simula
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Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Blakie
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