Vortex structures in dilute quantum fluids

Details Vortex structures in dilute quantum fluids Vortex structures in dilute quantum fluids

1999-07-15

arxiv.org/abs/cond-mat/9907224v1

Physics

Condensed Matter

7 pages, 16 postscript files for 6 figures

Scientific paper

10.1209/epl/i1999-00507-2

Vortex structures in dilute quantum fluids are studied using the Gross-Pitaevskii equation. The velocity and momentum of multiply quantized vortex rings are determined and their core structures analysed. For flow past a spherical object, we study the encircling and pinned ring solutions, and determine their excitation energies as a function of the flow velocity for both penetrable and impenetrable objects. The ring and laminar flow solutions converge at a critical velocity, which decreases with increasing object size. We also study the vortex solutions associated with flow past a surface bump which indicate that surface roughness also reduces the critical velocity. This effect may have important implications for the threshold of dissipation in superfluids and superconductors.

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