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Vortex dynamics in coherently coupled Bose-Einstein condensates | | Luca Calderaro
; Alexander L. Fetter
; Pietro Massignan
; Peter Wittek
; | | Date: |
13 Sep 2016 | | Abstract: | In classical hydrodynamics with uniform density, vortices move with the local
fluid velocity. This description is rewritten in terms of forces arising from
the interaction with other vortices. Two such positive straight vortices
experience a repulsive interaction and precess in a positive (anticlockwise)
sense around their common centroid. A similar picture applies to vortices in a
two-component two-dimensional uniform Bose-Einstein condensate (BEC) coherently
coupled through rf Rabi fields. Unlike the classical case, however, the rf Rabi
coupling induces an attractive interaction and two such vortices with positive
signs now rotate in the negative (clockwise) sense. Pairs of counter-rotating
vortices are instead found to translate with uniform velocity perpendicular to
the line joining their cores. This picture is extended to a single vortex in a
two-component trapped BEC. Although two uniform vortex-free components
experience familiar Rabi oscillations of particle-number difference, such
behavior is absent for a vortex in one component because of the nonuniform
vortex phase. Instead the coherent Rabi coupling induces a periodic vorticity
transfer between the two components. | | Source: | arXiv, 1609.3966 | | Services: | Forum | Review | PDF | Favorites | |
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