Multiple-quantized vortices in rotating LOFF state of ultracold Fermi superfluid gas

Details Multiple-quantized vortices in rotating LOFF state of ultracold Fermi superfluid gas Multiple-quantized vortices in rotating LOFF state of ultracold Fermi superfluid gas

2009-04-26

arxiv.org/abs/0904.4034v1

Phys. Rev. A 80, 043610 (2009)

Physics

Condensed Matter

Quantum Gases

5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.80.043610

A rotating ultracold S-wave superfluid Fermi gas is considered, when the population imbalance (or equivalently the mismatch in chemical potentials) corresponds to the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state in the vicinity of the Lifshitz critical point. It is shown that under these conditions the critical angular velocity in two-dimensional systems is an oscillating function of temperature and population imbalance giving rise to reentrant superfluid phases. This leads to vortex lattices with multiple-quantized circulation quanta. The reason for this behavior is the population by Cooper pairs of the Landau levels above the lowest one.

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