Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-10-29
New J. Phys. 13, 083022 (2011)
Physics
Condensed Matter
Quantum Gases
11 pages, 3 figures
Scientific paper
10.1088/1367-2630/13/8/083022
The Kibble-Zurek mechanism is applied to the spontaneous formation of vortices in a harmonically trapped thermal gas following a temperature quench through the critical value for Bose-Einstein condensation. While in the homogeneous scenario vortex nucleation is always expected, we show that it can be completely suppressed in the presence of the confinement potential, whenever the speed of the spatial front undergoing condensation is lower than a threshold velocity. Otherwise, the interplay between the geometry and causality leads to different scaling laws for the density of vortices as a function of the quench rate, as we also illustrate for the case of a toroidal trapping potential.
del Campo Adolfo
Plenio Martin . B.
Retzker Alex
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