Coreless vorticity in multicomponent Bose and Fermi superfluids

Details Coreless vorticity in multicomponent Bose and Fermi superfluids Coreless vorticity in multicomponent Bose and Fermi superfluids

2009-09-21

arxiv.org/abs/0909.3851v1

Phys. Rev. A 81, 033629 (2010)

Physics

Condensed Matter

Quantum Gases

7 pages, 4 figures

Scientific paper

10.1103/PhysRevA.81.033629

We consider quantized vortices in two-component Bose-Einstein condensates and three-component Fermi gases with attractive interactions. In these systems, the vortex core can be either empty (normal in the fermion case) or filled with another superfluid. We determine critical values of the parameters -- chemical potentials, scattering lengths and, for Fermi gases, temperature -- at which a phase transition between the two types of vortices occurs. Population imbalance can lead to superfluid core (coreless) vorticity in multicomponent superfluids which otherwise support only usual vortices. For multicomponent Fermi gases, we construct the phase diagram including regions of coreless vorticity. We extend our results to trapped bosons and fermions using an appropriate local approximation, which goes beyond the usual Thomas-Fermi approximation for trapped bosons.

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