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Phys Rev Lett. 2014 Sep 26;113(13):135302. Epub 2014 Sep 26.

Quench-induced supercurrents in an annular Bose gas.

Author information

1
Laboratoire Kastler Brossel, CNRS, UPMC, ENS, Collège de France, 24 Rue Lhomond, 75231 Paris Cedex 05, France.
2
Laboratoire Kastler Brossel, CNRS, UPMC, ENS, Collège de France, 24 Rue Lhomond, 75231 Paris Cedex 05, France and Collège de France, 11 Place Marcelin Berthelot, 75005 Paris, France.
3
Institut für Quantenelektronics, ETH Zurich, 8093 Zurich, Switzerland.
4
Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany.

Abstract

We create supercurrents in annular two-dimensional Bose gases through a temperature quench of the normal-to-superfluid phase transition. We detect the magnitude and the direction of these supercurrents by measuring spiral patterns resulting from the interference of the cloud with a central reference disk. These measurements demonstrate the stochastic nature of the supercurrents. We further measure their distribution for different quench times and compare it with predictions based on the Kibble-Zurek mechanism.

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