We study the spontaneous formation of defects in the order parameter of a trapped ultracold bosonic gas while crossing the critical temperature for Bose-Einstein condensation at different rates. The system has the shape of an elongated ellipsoid, whose transverse width can be varied. For slow enough temperature quenches we find a power-law scaling of the average defect number with the quench rate, as predicted by the Kibble-Zurek mechanism. A breakdown of such a scaling is found for fast quenches, leading to a saturation of the average defect number. We suggest an explanation for this saturation in terms of the mutual interactions among defects.

Creation and counting of defects in a temperature-quenched Bose-Einstein condensate / Donadello, S; Serafini, S; Bienaimé, T; Dalfovo, F; Lamporesi, G; Ferrari, G. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 94:2(2016), p. 02362. [10.1103/physreva.94.023628]

Creation and counting of defects in a temperature-quenched Bose-Einstein condensate

Donadello, S;
2016

Abstract

We study the spontaneous formation of defects in the order parameter of a trapped ultracold bosonic gas while crossing the critical temperature for Bose-Einstein condensation at different rates. The system has the shape of an elongated ellipsoid, whose transverse width can be varied. For slow enough temperature quenches we find a power-law scaling of the average defect number with the quench rate, as predicted by the Kibble-Zurek mechanism. A breakdown of such a scaling is found for fast quenches, leading to a saturation of the average defect number. We suggest an explanation for this saturation in terms of the mutual interactions among defects.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/73466
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