Fulde-Ferrell-Larkin-Ovchinnikov state to topological superfluidity transition in bilayer spin-orbit coupled degenerate Fermi gas
arXiv:1702.04735 · doi:10.1103/PhysRevA.95.053628
Abstract
Recently a scheme has been proposed for generating the 2D Rashba-type spin-orbit coupling (SOC) for ultracold atomic bosons in a bilayer geometry [S.-W. Su et al, Phys. Rev. A \textbf{93}, 053630 (2016)]. Here we investigate the superfluidity properties of a degenerate Fermi gas affected by the SOC in such a bilayer system. We demonstrate that a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state appears in the regime of small to moderate atom-light coupling. In contrast to the ordinary SOC, the FFLO state emerges in the bilayer system without adding any external fields or spin polarization. As the atom-light coupling increases, the system can transit from the FFLO state to a topological superfluid state. These findings are also confirmed by the BdG simulations with a weak harmonic trap added.
9 pages, 7 figures
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Cited by in corpus (8)
- The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
- Spin-orbit coupling and topological phases for ultracold atoms
- Exotic Vortex States with Discrete Rotational Symmetry in Atomic Fermi Gases with Spin-Orbital-Angular-Momentum Coupling
- Fulde-Ferrell-Larkin-Ovchinnikov state in spin-orbit-coupled superconductors
- Bardasis-Schrieffer-like phase mode in a superconducting bilayer
- Larkin-Ovchinikov superfluidity in time-reversal symmetric bilayer Fermi gases
- Fulde-Ferrell superfluids in spinless ultracold Fermi gases
- Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gases