Vortex Dynamics in an Annular Bose-Einstein Condensate

Abstract

We theoretically show that the topology of a non-simply-connected annular atomic Bose-Einstein condensate enforces the inner surface waves to be always excited with outer surface excitations and that the inner surface modes are associated with induced vortex dipoles unlike the surface waves of a simply-connected one with vortex monopoles. Consequently, under stirring to drive an inner surface wave, a peculiar population oscillation between the inner and outer surface is generated regardless of annulus thickness. Moreover, a new vortex nucleation process by stirring is observed that can merge the inner vortex dipoles and outer vortex into a single vortex inside the annulus. The energy spectrum for a rotating annular condensate with a vortex at the center also reveals the distinct connection of the Tkachenko modes of a vortex lattice to its inner surface excitations.

5 pages, 6 figures

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Cited by in corpus (12)

• Threshold for creating excitations in a stirred superfluid ring
• Persistent currents with non-quantized angular momentum
• Vortices in a toroidal Bose-Einstein condensate with a rotating weak link
• Vortex excitation in a stirred toroidal Bose-Einstein condensate
• Analysis of a trapped Bose-Einstein condensate in terms of position, momentum, and angular-momentum variance
• Metastability, excitations, fluctuations, and multiple-swallowtail structures of a superfluid in a Bose-Einstein condensate in the presence of a uniformly moving defect
• Toroidal Dipolar Supersolid with a Rotating Weak Link
• Condensates in annuli: Dimensionality of the variance
• Phonon-Josephson resonances in atomtronic circuits
• Rotational properties of non-dipolar and dipolar Bose-Einstein condensates confined in annular potentials
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