Three-dimensional spin-orbit coupled Fermi gases: Fulde-Ferrell pairing, Majorana fermions, Weyl fermions and gapless topological superfluidity
arXiv:1411.2993 · doi:10.1088/1674-1056/24/5/050502
Abstract
We theoretically investigate a three-dimensional Fermi gas with Rashba spin-orbit coupling in the presence of both out-of-plane and in-plane Zeeman fields. We show that, driven by a sufficiently large Zeeman field, either out-of-plane or in-plane, the superfluid phase of this system exhibits a number of interesting features, including inhomogeneous Fulde-Ferrell pairing, gapped or gapless topological order and exotic quasi-particle excitations known as Weyl fermions that have linear energy dispersions in momentum space (i.e., massless Dirac fermions). The topological superfluid phase can have either four or two topologically protected Weyl nodes. We present the phase diagrams at both zero and finite temperatures and discuss the possibility of their observation in an atomic Fermi gas with synthetic spin-orbit coupling. In this context, topological superfluid phases with an imperfect Rashba spin-orbit coupling are also studied.
13 pages, 14 figures
References in corpus (17)
- Theory of ultracold Fermi gases
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Degenerate Quantum Gases with Spin-Orbit Coupling
- Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
- Theory of 2D superconductor with broken inversion symmetry
- BCS-BEC crossover induced by a synthetic non-Abelian gauge field
- Probing non-Abelian statistics of Majorana fermions in ultracold atomic superfluid
- Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields
- Comparative study of strong coupling theories of a trapped Fermi gas at unitarity
- 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
- Effects of spin-orbit coupling on the Berezinskii-Kosterlitz-Thouless transition and the vortex-antivortex structure in two-dimensional Fermi gases
- Topological Fulde-Ferrell Superfluids of a Spin-Orbit Coupled Fermi Gas
- Gapless topological Fulde-Ferrell superfluidity induced by in-plane Zeeman field
- Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
- Thermodynamic Properties of Rashba Spin-Orbit-Coupled Fermi Gas