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arXiv · 2009.03424

Neutral vortex necklace in a trapped planar superfluid

M. M. Cawte·M. T. Reeves·A. S. Bradley
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Abstract

We study quantum vortex states consisting of a ring of vortices with alternating sign, in a homogeneous superfluid confined to a circular domain. We find an exact stationary solution of the point vortex model for the neutral vortex necklace. We investigate the stability of the necklace state within both the point-vortex model and the Gross-Pitaevskii equation describing a trapped atomic Bose-Einstein condensate at low temperature. The point-vortex stationary states are found to also be stationary states of the Gross-Pitaevskii equation provided the finite thickness of the outer fluid boundary is accounted for. Under significant perturbation, the Gross-Pitaevskii evolution and point-vortex model exhibit instability as expected for metastable states. The perturbed vortex necklace exhibits sensitivity to the perturbation, suggesting a route to seeding vortex chaos or quantum turbulence.

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M. M. Cawte, M. T. Reeves, A. S. Bradley. 2020-09-07. Neutral vortex necklace in a trapped planar superfluid. https://doi.org/10.1007/s10909-020-02547-7

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