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Generating vortex rings in Bose-Einstein condensates in the line-source approximation
Guilleumas, Montserrat; Jezek, Dora M.; Mayol Sánchez, Ricardo; Pi Pericay, Martí; Barranco Gómez, Manuel
Universitat de Barcelona
We present a numerical method for generating vortex rings in Bose-Einstein condensates confined in axially symmetric traps. The vortex ring is generated using the line-source approximation for the vorticity, i.e., the curl of the superfluid velocity field is different from zero only on a circumference of a given radius located on a plane perpendicular to the symmetry axis and coaxial with it. The particle density is obtained by solving a modified Gross-Pitaevskii equation that incorporates the effect of the velocity field. We discuss the appearance of density profiles, the vortex core structure, and the vortex nucleation energy, i.e., the energy difference between vortical and ground-state configurations. This is used to present a qualitative description of the vortex dynamics.
04-05-2010
Condensació de Bose-Einstein
Moviment de vòrtexs
Bose-Einstein condensation
Vortex motion
(c) The American Physical Society, 2002
Artículo
The American Physical Society
         

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