Inhomogeneous Fulde-Ferrell superfluidity in spin-orbit coupled atomic Fermi gases
arXiv:1302.0553 · doi:10.1103/PhysRevA.87.051608
Abstract
Inhomogeneous superfluidity lies at the heart of many intriguing phenomena in quantum physics. It is believed to play a central role in unconventional organic or heavy-fermion superconductors, chiral quark matter, and neutron star glitches. However, so far even the simplest form of inhomogeneous superfluidity, the Fulde-Ferrell (FF) pairing state with a single centre-of-mass momentum, is not conclusively observed due to the intrinsic complexibility of any realistic Fermi systems in nature. Here we theoretically predict that the controlled setting of ultracold fermionic atoms with synthetic spin-orbit coupling induced by a two-photon Raman process, demonstrated recently in cold-atom laboratories, provides a promising route to realize the long-sought FF superfluidity. At experimentally accessible low temperatures (i.e., , where is the Fermi temperature), the FF superfluid state dominates the phase diagram, in sharp contrast to the conventional case without spin-orbit coupling. We show that the finite centre-of-mass momentum carried by Cooper pairs is directly measurable via momentum-resolved radio-frequency spectroscopy. Our work opens the way to direct observation and characterization of inhomogeneous superfluidity.
5 pages and 4 figures; Please see also arXiv:1211.1831 by V. B. Shenoy for relevant discussions
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- Anisotropic Weyl Fermions from Quasiparticle Excitation Spectrum of a 3D Fulde-Ferrell Superfluid
- Competing superfluid orders in spin-orbit coupled fermionic cold atom optical lattices
- Gapless topological Fulde-Ferrell superfluidity in spin-orbit coupled Fermi gases
- Topological Fulde-Ferrell superfluid in spin-orbit coupled atomic Fermi gases
- Berezinskii-Kosterlitz-Thouless Phase Transition in 2D Spin-Orbit Coupled Fulde-Ferrell Superfluids
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- Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases
- Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling
- Topological Fulde-Ferrell Superfluids of a Spin-Orbit Coupled Fermi Gas
- Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
- Gapless topological Fulde-Ferrell superfluidity induced by in-plane Zeeman field
- FFLO or Majorana superfluids: The fate of fermionic cold atoms in spin-orbit coupled optical lattices
- Fulde-Ferrell superfluidity in ultracold Fermi gases with Rashba spin-orbit coupling
- Realizing Fulde-Ferrell Superfluids via a Dark-State Control of Feshbach Resonances
- Unconventional Fulde-Ferrell-Larkin-Ovchinnikov pairing states in a Fermi gas with spin-orbit coupling
- Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit coupled Fulde-Ferrell superfluid
- Three-dimensional spin-orbit coupled Fermi gases: Fulde-Ferrell pairing, Majorana fermions, Weyl fermions and gapless topological superfluidity
- Larkin-Ovchinnikov superfluidity in a two-dimensional imbalanced atomic Fermi gas
- Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
- Fulde-Ferrell-Larkin-Ovchinnikov state in spin-orbit-coupled superconductors
- Thermodynamic Properties of Rashba Spin-Orbit-Coupled Fermi Gas
- Topological Uniform Superfluid and FFLO Phases in 3D to 1D crossover of spin-orbit coupled Fermi gases
- Unconventional superconductivity of an altermagnetic metal: Polarized BCS and inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states
- Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas
- Superfluid weight and Berezinskii-Kosterlitz-Thouless temperature of spin-imbalanced and spin-orbit-coupled Fulde-Ferrell phases in lattice systems
- Spontaneous appearance of nonzero momentum Cooper pairing: Possible application to the iron-pnictides
- BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit coupling
- Quantum Lifshitz points in an altermagnetic metal
- Non-Galilean response of Rashba coupled Fermi gases
- Energetics and structural properties of two- and three-boson systems in the presence of 1D spin-orbit coupling
- Altermagnetism-driven FFLO superconductivity in finite-filling 2D lattices
- Phase diagrams of tunable spin-orbit coupled Bose-Einstein condensates
- Novel dynamical excitations and roton-based measurement of Cooper-pair momentum in a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superfluid on optical lattices