Vortex line in spin-orbit coupled atomic Fermi gases

Details Vortex line in spin-orbit coupled atomic Fermi gases Vortex line in spin-orbit coupled atomic Fermi gases

2011-11-28

arxiv.org/abs/1111.6450v2

Phys. Rev. A. 85, 013622 (2012)

Physics

Condensed Matter

Quantum Gases

7 pages with 6 figures; minor changes

Scientific paper

It has recently been shown that the spin-orbit coupling gives rise to topologically-nontrivial and thermodynamically-stable gapless superfluid phases when the pseudo-spin populations of an atomic Fermi gas is imbalanced, with the possibility of featuring Majorana zero-energy quasiparticles. In this paper, we consider a Rashba-type spin-orbit coupling, and use the Bogoliubov-de Gennes formalism to analyze a single vortex line along a finite cylinder with a periodic boundary condition. We show that the signatures for the appearance of core- and edge-bound states can be directly found in the density of single-particle states and particle-current density. In particular, we find that the pseudo-spin components counterflow near the edge of the cylinder, the strength of which increases with increasing spin-orbit coupling.

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