Solitonic vortices in Bose-Einstein condensates

Year: 2015

Authors: Tylutki M., Donadello S., Serafini S., Pitaevskii L.P., Dalfovo F., Lamporesi G., Ferrari G.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy

Abstract: We analyse, theoretically and experimentally, the nature of solitonic vortices (SV) in an elongated Bose-Einstein condensate. In the experiment, such defects are created via the Kibble-Zurek mechanism, when the temperature of a gas of sodium atoms is quenched across the BEC transition, and are imaged after a free expansion of the condensate. By using the Gross-Pitaevskii equation, we calculate the in-trap density and phase distributions characterizing a SV in the crossover from an elongated quasi-1D to a bulk 3D regime. The simulations show that the free expansion strongly amplifies the key features of a SV and produces a remarkable twist of the solitonic plane due to the quantized vorticity associated with the defect. Good agreement is found between simulations and experiments.


Volume: 224 (3)      Pages from: 577  to: 583

More Information: We thank J. Brand, C. Tozzo and M. Zwierlein for stimulating discussions. We acknowledge financial support by Provincia Autonoma di Trento and by PL-Grid Infrastructure.
DOI: 10.1140/epjst/e2015-02389-7

Citations: 17
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