Vortices in a toroidal Bose-Einstein condensate with a rotating weak link
arXiv:1409.6260 · doi:10.1103/PhysRevA.91.033607
Abstract
Motivated by a recent experiment [K.C. Wright et. al. Phys. Rev. Lett. 110, 025302 (2013)], we investigate deterministic discontinuous jumps between quantized circulation states in a toroidally trapped Bose-Einstein condensate. These phase slips are induced by vortex excitations created by a rotating weak link. We analyze influence of a localized condensate density depletion and atomic superflows, governed by the rotating barrier, on the energetic and dynamical stability of the vortices in the ring-shaped condensate. We simulate in a three-dimensional dissipative mean field model the dynamics of the condensate using parameters similar to the experimental conditions. Moreover, we consider the dynamics of the stirred condensate far beyond the experimentally explored region and reveal surprising manifestations of complex vortex dynamics.
8 pages, 8 figures. Contact A.I. Yakimenko for supplemental information
References in corpus (8)
- Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
- Persistent currents in spinor condensates
- Interferometric measurement of the current-phase relationship of a superfluid weak link
- Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation
- Critical Rotation of an Annular Superfluid Bose Gas
- Bose-Einstein condensates in toroidal traps: instabilities, swallow-tail loops, and self-trapping
- Vortex excitation in a stirred toroidal Bose-Einstein condensate
- Vortex Dynamics in an Annular Bose-Einstein Condensate