Vortex molecules in coherently coupled two-component Bose-Einstein condensates

Details Vortex molecules in coherently coupled two-component Bose-Einstein condensates Vortex molecules in coherently coupled two-component Bose-Einstein condensates

2004-06-07

arxiv.org/abs/cond-mat/0406150v2

Phys. Rev. Lett. 93, 250406 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, greatly revised version

Scientific paper

10.1103/PhysRevLett.93.250406

A vortex molecule is predicted in rotating two-component Bose-Einstein condensates whose internal hyperfine states are coupled coherently by an external field. A vortex in one component and that in the other are connected by a domain wall of the relative phase, constituting a "vortex molecule", which features a nonaxisymmetric (pseudo)spin texture with a pair of merons. The binding mechanism of the vortex molecule is discussed based on a generalized nonlinear sigma model and a variational ansatz. The anisotropy of vortex molecules is caused by the difference in the scattering lengths, yielding a distorted vortex-molecule lattice in fast rotating condensates.

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