Fulde-Ferrell states in unequally charged Fermi gases
arXiv:2005.04276 · doi:10.1103/PhysRevA.101.053614
Abstract
Atoms with different internal states can exhibit different responses to an artificial magnetic field. An atomic gas mixture of two different components can therefore be interpreted as a mixture of two atomic gases carrying different synthetic charges. We consider the superfluid state of such unequally charged Fermi gases coupled to a magnetic field via the orbital effect and trapped in a torus geometry. The orbital coupling to the magnetic field favors an inhomogeneous superfluid state with optimum finite center-of-mass momentum pairing. The resulting population-balanced orbital Fulde-Ferrell (FF) state is robust against the magnetic field and does not undergo pair breaking unlike the conventional BCS and Fulde-Ferrell-Larkin-Ovchinnikov type pairing states under the Zeeman effect. We contrast the homogeneous and inhomogeneous cases emphasizing the advantages of the unequally charged systems and present their momentum distributions. We conclude that an unequally charged atomic Fermi gas system orbitally coupled to an artificial magnetic field provides an ideal candidate for experimental realization of the FF state.
arXiv comment7 pages, 4 figures
References in corpus (41)
- Synthetic magnetic fields for ultracold neutral atoms
- Pairing and Phase Separation in a Polarized Fermi Gas
- Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
- Inhomogeneous Superconductivity in Condensed Matter and QCD
- Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
- A Bose-Einstein Condensate in a Uniform Light-induced Vector Potential
- Spin-Imbalance in a One-Dimensional Fermi Gas
- Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
- Phase diagram of a strongly interacting polarized Fermi gas in one dimension
- Imbalanced Feshbach-resonant Fermi gases
- Persistent currents in spinor condensates
- Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
- Resistive flow in a weakly interacting Bose-Einstein condensate
- Two-species fermion mixtures with population imbalance
- Fluctuations and phase transitions in Larkin-Ovchinnikov liquid crystal states of population-imbalanced resonant Fermi gas
- Free Energy of an Inhomogeneous Superconductor: a Wave Function Approach
- Thermodynamic evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the KFe2As2 superconductor
- Pauli-Limited Multiband Superconductivity in KFe2As2
- Microscopic study of the Fulde-Ferrell-Larkin-Ovchinnikov state in an all-organic superconductor
- Paired states in spin-imbalanced atomic Fermi gases in one dimension
- FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
- Superfluidity at the BEC-BCS crossover in two-dimensional Fermi gases with population and mass imbalance
- Spectral signatures of the Fulde-Ferrell-Larkin-Ovchinnikov order parameter in one-dimensional optical lattices
- Existence of the LOFF State in Superconducting UPd_2Al_3
- Phase structure of mass- and spin-imbalanced unitary Fermi gases
- Phase separation of trapped spin-imbalanced Fermi gases in one-dimensional optical lattices
- The Fulde-Ferrell-Larkin-Ovchinnikov state in pnictides
- Fulde-Ferrell-Larkin-Ovchinnikov Phases in Two-dimensional Spin-Orbit Coupled Degenerate Fermi Gases
- Integrable models for asymmetric Fermi superfluids: Emergence of a new exotic pairing phase
- Topological superfluid phases of an atomic Fermi gas with in- and out-of-plane Zeeman fields and equal Rashba-Dresselhaus spin-orbit coupling
- Goldstone modes in Larkin-Ovchinnikov-Fulde-Ferrell superconductors
- Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
- Renormalization theory for the Fulde-Ferrell-Larkin-Ovchinnikov states at
- Quantum FFLO state in clean layered superconductors
- Stability of Sarma phases in density imbalanced electron-hole bilayer systems
- Rotating Fulde-Ferrell-Larkin-Ovchinnikov state in cold Fermi gases
- Topological defects in mixtures of superconducting condensates with different charges
- Orbital Effect for the Fulde-Ferrell-Larkin-Ovchinnikov Phase in a Quasi-Two-Dimensional Superconductor in a Parallel Magnetic Field
- Pairing of Fermions with Unequal Effective Charges in an Artificial Magnetic Field
- Mixture of two unequally charged superfluids in a magnetic field
- Two-dimensional imbalanced Fermi gas in antiparallel magnetic fields