1. Generating vortex rings in Bose-Einstein condensates in the line-source approximation
- Author
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Martí Pi, M. Guilleumas, Ricardo Mayol, Manuel Barranco, Dora Marta Jezek, and Universitat de Barcelona
- Subjects
Physics ,Condensed Matter::Quantum Gases ,Condensed matter physics ,Condensed Matter (cond-mat) ,FOS: Physical sciences ,Condensed Matter ,Vorticity ,Bose-Einstein condensation ,Vortex-motion ,Atomic and Molecular Physics, and Optics ,Vortex ring ,Vortex ,law.invention ,Vortex motion ,Superfluidity ,Moviment de vòrtexs ,law ,Vortex stretching ,Condensed Matter::Superconductivity ,Condensació de Bose-Einstein ,Burgers vortex ,Axial symmetry ,Bose–Einstein condensate - Abstract
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 rotational of the superfluid velocity field is different from zero only on a circumference of 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., Comment: Accepted for publication in Phys. Rev. A
- Published
- 2002
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