Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas

Abstract

We theoretically analyze the pairing instability of a three-dimensional ultracold atomic Fermi gas towards a Fulde-Ferrell superfluid, in the presence of Rashba spin-orbit coupling and in-plane Zeeman field. We use the standard Thouless criterion for the onset of superfluidity, with which the effect of pair fluctuations is partially taken into account by approximately using a mean-field chemical potential at zero temperature. This gives rise to an improved prediction of the superfluid transition temperature beyond mean-field, particularly in the strong-coupling unitary limit. We also investigate the pairing instability with increasing Rashba spin-orbit coupling, along the crossover from a Bardeen-Cooper-Schrieffer superfluid to a Bose-Einstein condensate of Rashbons (i.e., the tightly bound state of two fermions formed by strong Rashba spin-orbit coupling

8 pages, 9 figures

References in corpus (17)

• Many-Body Physics with Ultracold Gases
• Non-Abelian Anyons and Topological Quantum Computation
• Theory of ultracold Fermi gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
• Phase diagram of a strongly interacting polarized Fermi gas in one dimension
• Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
• BCS-BEC crossover induced by a synthetic non-Abelian gauge field
• Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
• Chiral Rashba spin textures in ultra-cold Fermi gases
• Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields
• BCS-BEC crossover in an asymmetric two-component Fermi gas
• Finite temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
• Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas
• Majorana fermions in one-dimensional spin-orbit coupled Fermi gases
• Universal impurity-induced bound state in topological superfluids
• Topological Fulde-Ferrell superfluid in spin-orbit coupled atomic Fermi gases

Cited by in corpus (5)

• The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
• Anisotropic Weyl Fermions from Quasiparticle Excitation Spectrum of a 3D Fulde-Ferrell Superfluid
• Topological Fulde-Ferrell Superfluids of a Spin-Orbit Coupled Fermi Gas
• Large Chern Number Topological Superfluids in Coupled Layer System
• Three-dimensional spin-orbit coupled Fermi gases: Fulde-Ferrell pairing, Majorana fermions, Weyl fermions and gapless topological superfluidity