Imbalanced Feshbach-resonant Fermi gases

Abstract

We present an overview of recent developments in species-imbalanced ("polarized") Feshbach-resonant Fermi gases. We summarize the current status of thermodynamics of these systems in terms of a phase diagram as a function of the Feshbach resonance detuning, polarization and temperature. We review instabilities of the s-wave superfluidity across the BEC-BCS crossover to phase separation, FFLO states, polarized molecular superfluidity and the normal state, driven by the species imbalance. We discuss different models and approximations of this system and compare their predictions to current experiments.

38 pages, 10 figures. Invited review article for Reports on Progress in Physics. Numerous minor updates.

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• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Theory of ultracold Fermi gases
• Color superconductivity in dense quark matter
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• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Weakly bound dimers of fermionic atoms
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Spin-Imbalance in a One-Dimensional Fermi Gas
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Resonantly-paired fermionic superfluids
• Thermodynamics of the BCS-BEC crossover
• Phase diagram of a two-component Fermi gas with resonant interactions
• Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Normal state of a polarized Fermi gas at unitarity
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Phase diagram of a strongly interacting polarized Fermi gas in one dimension
• Imbalanced Feshbach-resonant Fermi gases
• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
• Polaron to molecule transition in a strongly imbalanced Fermi gas
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Pairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice
• Quasi-one-dimensional polarized Fermi superfluids
• Phase diagram of a cold polarized Fermi gas
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Theory of RF-spectroscopy of strongly interacting Fermions
• Interaction-controlled transport of an ultracold Fermi gas
• Two-species fermion mixtures with population imbalance
• A Unitary Fermi Supersolid: The Larkin-Ovchinnikov Phase
• Nonequilibrium dynamics and thermodynamics of a degenerate Fermi gas across a Feshbach resonance
• Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates
• Exact quantum Monte Carlo study of one dimensional trapped fermions with attractive contact interactions
• Induced P-wave Superfluidity in Asymmetric Fermi Gases
• Large-N expansion for unitary superfluid Fermi gases
• Exact Numerical Study of Pair Formation with Imbalanced Fermion Populations
• Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas
• Ground state of a tightly bound composite dimer immersed in a Fermi Sea
• Fermi gas near unitarity around four and two spatial dimensions
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions
• Surface Tension in Unitary Fermi Gases with Population Imbalance
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Larkin-Ovchinnikov state in resonant Fermi gas
• Mean field thermodynamics of a spin-polarized spherically trapped Fermi gas at unitarity
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
• The role of interactions in spin-polarised atomic Fermi gases at unitarity
• Signature of the FFLO phase in the collective modes of a trapped ultracold Fermi gas
• Realization and Detection of Fulde-Ferrell-Larkin-Ovchinnikov Superfluid Phases in Trapped Atomic Fermion Systems
• Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Pair formation and collapse in imbalanced Fermion populations with unequal masses
• Non-BCS superfluidity in trapped ultracold Fermi gases
• Phase separation in imbalanced fermion superfluids beyond mean-field
• Comment on "Superfluid stability in the BEC-BCS crossover"
• Spinodal decomposition in polarised Fermi superfluids
• Spin-polarized Fermi superfluids as Bose-Fermi mixtures
• Superfluid transition in a rotating resonantly-interacting Fermi gas
• Polarized superfluids near their tricritical point
• A Mean Field Analysis of Pairing in Asymmetric Fermi Systems at Finite Temperature
• Measurement of Conduction Electron Polarization Via the Pairing Resonance

Cited by in corpus (166)

• Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
• The Physics of Pair Density Waves
• Non-standard Hubbard models in optical lattices: a review
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• Homogeneous Atomic Fermi Gases
• Imbalanced Feshbach-resonant Fermi gases
• Ultra-cold Polarized Fermi Gases
• Imaging magnetic polarons in the doped Fermi-Hubbard model
• Fermi polarons in two dimensions
• Topological Fulde-Ferrel-Larkin-Ovchinnikov states in Spin-orbit Coupled Fermi Gases
• The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
• Fluctuations and phase transitions in Larkin-Ovchinnikov liquid crystal states of population-imbalanced resonant Fermi gas
• Physics of higher orbital bands in optical lattices: a review
• Imbalanced Fermi Gases at Unitarity
• Hydrodynamic Expansion of a Strongly Interacting Fermi-Fermi Mixture
• Complex Langevin and other approaches to the sign problem in quantum many-body physics
• Observation of coherent multiorbital polarons in a two-dimensional Fermi gas
• Thermodynamics of balanced and slightly spin-imbalanced Fermi gases at unitarity
• Long-time behavior of the momentum distribution during the sudden expansion of a spin-imbalanced Fermi gas in one dimension
• Stable giant vortex annuli in microwave-coupled atomic condensates
• Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms
• 1D to 3D Crossover of a Spin-Imbalanced Fermi Gas
• When Superconductivity Crosses Over: From BCS to BEC
• Resonantly Interacting Fermi-Fermi Mixture of ${}^{161}$Dy and ${}^{40}$K
• Quench dynamics of a strongly interacting resonant Bose gas
• Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in 2D and 3D optical lattices
• Self-consistent multiple complex-kink solutions in Bogoliubov-de Gennes and chiral Gross-Neveu systems
• Feshbach resonances in $p$-wave three-body recombination within Fermi-Fermi mixtures of open-shell ${}^6$Li and closed-shell ${}^{173}$Yb atoms
• Mass imbalance effect in resonant Bose-Fermi mixtures
• Physics of ultracold Fermi gases revealed by spectroscopies
• Inhomogeneous Fulde-Ferrell superfluidity in spin-orbit coupled atomic Fermi gases
• Theory of radio-frequency spectroscopy of impurities in quantum gases
• Pair density wave order from electron repulsion
• Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases
• Pseudogap and preformed pairs in the imbalanced Fermi gas in two dimensions
• Suppressed solitonic cascade in spin-imbalanced superfluid Fermi gas
• A low energy theory for superfluid and solid matter and its application to the neutron star crust
• Pair tunneling, phase separation and dimensional crossover in imbalanced fermionic superfluids in a coupled array of tubes
• Phase Diagram of a Strongly Interacting Spin-Imbalanced Fermi Gas
• Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture
• Virial expansion for a strongly correlated Fermi gas with imbalanced spin populations
• Oscillatory pairing amplitude and magnetic compressible-incompressible transitions in imbalanced fermionic superfluids in optical lattices of elongated tubes
• Post-quench dynamics and pre-thermalization in a resonant Bose gas
• Modulated pair condensate of p-orbital ultracold fermions
• Quantum liquid-crystal order in resonant atomic gases
• Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
• Fulde-Ferrell-Larkin-Ovchinnikov pairing as leading instability on the square lattice
• Current-carrying states in FFLO superconductors
• Realization of a Cold Mixture of Fermionic Chromium and Lithium Atoms
• Measuring pair correlations in Bose and Fermi gases via atom-resolved microscopy
• Ring solitons and soliton sacks in imbalanced fermionic systems
• Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
• Highly Polarized Fermi Gases across a Narrow Feshbach Resonance
• Renormalization theory for the Fulde-Ferrell-Larkin-Ovchinnikov states at $T>0$
• Resonant enhancement of the FFLO-state in 3D by a one-dimensional optical potential
• Controlling the pair momentum of the FFLO state in a 3D Fermi gas through a 1D periodic potential
• Polarized fermions in one dimension: density and polarization from complex Langevin calculations, perturbation theory, and the virial expansion
• Superfluid Phase Transitions and Effects of Thermal Pairing Fluctuations in Asymmetric Nuclear Matter
• Spin imbalance effect on Larkin-Ovchinnikov-Fulde-Ferrel state
• Fluctuations of imbalanced fermionic superfluids in two dimensions induce continuous quantum phase transitions and non-Fermi liquid behavior
• Spatially Modulated Vacua in a Lorentz-invariant Scalar Field Theory
• Fulde-Ferrell superfluidity in ultracold Fermi gases with Rashba spin-orbit coupling
• Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
• Pair excitations and parameters of state of imbalanced Fermi gases at finite temperatures
• Sarma phase in relativistic and non-relativistic systems
• A strongly interacting Sarma superfluid near orbital Feshbach resonances
• Exotic Superfluid Phases in Spin Polarized Systems on Optical Lattices
• Induced p-wave superfluidity in strongly interacting imbalanced Fermi gases
• Quench dynamics of spin-imbalanced Fermi-Hubbard model in one dimension
• Mystery of Excess Low Energy States in a Disordered Superconductor in a Zeeman Field
• Pairing patterns in one-dimensional spin- and mass-imbalanced Fermi gases
• Fulde-Ferrell-Larkin-Ovchinnikov states in a superconducting ring with magnetic fields: Phase diagram and the first-order phase transitions
• The strongly driven Fermi polaron
• Density, spin, and pairing instabilities in polarized ultracold Fermi gases
• Inhomogeneous Superconducting States of Mesoscopic Thin-Walled Cylinders in External Magnetic Fields
• Critical endpoint and universality class of neutron ${}^3{P}_2$ superfluids in neutron stars
• Zeeman-limited Superconductivity in Crystalline Al Films
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
• Polaron spectroscopy of interacting Fermi systems: insights from exact diagonalization
• Larkin-Ovchinnikov superfluidity in a two-dimensional imbalanced atomic Fermi gas
• Extremely imbalanced two-dimensional electron-hole-photon systems
• Exploring emergent heterogeneous phases in strongly repulsive Fermi gases
• Topological Larkin-Ovchinnikov phase and Majorana zero mode chain in bilayer superconducting topological insulator films
• Temporally, Spatially or Light-like Modulated Vacua in Lorentz Invariant Theories
• Self-consistent theory of $2\times 2$ pair density waves in kagome superconductors
• Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
• Collective modes of a soliton train in a Fermi superfluid
• Superfluidity in Two-Dimensional Imbalanced Fermi Gases
• Finite-momentum superfluidity and phase transitions in a p-wave resonant Bose gas
• Oscillatory pairing of fermions in spin-split traps
• Observation of Feshbach resonances in an ${}^{167}$Er-${}^6$Li Fermi-Fermi mixture
• Dimensional Crossover in a Spin-imbalanced Fermi gas
• Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
• Disordered structures in ultracold spin-imbalanced Fermi gas
• Non-Hermitian BCS-BEC crossover of Dirac fermions
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
• Larkin-Ovchinnikov phases in two-dimensional square lattices
• Synthetic nuclear Skyrme matter in imbalanced Fermi superfluids with a multicomponent order parameter
• Chiral twodimensional p-wave superfluid from s-wave pairing in the BEC regime
• Collective mode contributions to the Meissner effect: Fulde-Ferrell and pair-density wave superfluids
• Reentrant Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in the honeycomb lattice
• Pairing patterns in polarized unitary Fermi gases above the superfluid transition
• Asymmetric Avalanches in the Condensate of a Zeeman-limited Superconductor
• Proposal for interferometric detection of topological defects in modulated superfluids
• Application of lasers to ultracold atoms and molecules
• Lattice QCD with mismatched Fermi surfaces
• Effective potential and quantum criticality for imbalanced Fermi mixtures
• Unconventional superconductivity of an altermagnetic metal: Polarized BCS and inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states
• Fulde-Ferrell-Larkin-Ovchinnikov state in bilayer dipolar systems
• Piezo-superconductivity: new effects in non-centrosymmetric superconductors
• Unusual destruction and enhancement of superfluidity of atomic Fermi gases by population imbalance in a one-dimensional optical lattice
• Application of renormalized RPA to polarized Fermi gases
• Correlated Phases of Population Imbalanced Fermi-Fermi Mixtures on an Optical Lattice
• Stability of the Fulde-Ferrell-Larkin-Ovchinnikov states in anisotropic systems and critical behavior at thermal $m$-axial Lifshitz points
• Flat-band Fulde-Ferrell-Larkin-Ovchinnikov State from Quantum Geometric Discrepancy
• Superfluid weight and Berezinskii-Kosterlitz-Thouless temperature of spin-imbalanced and spin-orbit-coupled Fulde-Ferrell phases in lattice systems
• Phase separations induced by a trapping potential in one-dimensional fermionic systems as a source of core-shell structures
• Fulde-Ferrell-Larkin-Ovchinnikov superconductors near a surface
• Spin-imbalanced ultracold Fermi gases in a two-dimensional array of tubes
• Triplet pair correlations in {\it s-}wave superfluids as a signature of the FFLO state
• Linear response of heat conductivity of normal-superfluid interface of a polarized Fermi gas to orbital magnetic field
• Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas
• Do phase fluctuations influence the Fulde-Ferrell-Larkin-Ovchinnikov state in a 3D Fermi gas?
• Generic nodeless Larkin Ovchinnikov states due to singlet-triplet mixing
• Spectra of heavy polarons and molecules coupled to a Fermi sea
• Competition between the Fulde-Ferrell-Larkin-Ovchinnikov phase and the BCS phase in the presence of an optical potential
• Pairing correlations in a trapped one-dimensional Fermi gas
• Collective excitations of an imbalanced fermion gas in a 1D optical lattice
• Stabilising Fulde-Ferrel-Larkin-Ovchinnikov Superfluidity with long-range Interactions in a mixed dimensional Bose-Fermi System
• Larkin-Ovchinikov superfluidity in time-reversal symmetric bilayer Fermi gases
• Low-energy modes of spin-imbalanced Fermi gases in BCS phase
• Density and Spin Linear Response of Atomic Fermi Superfluids with Population Imbalance in BCS-BEC Crossover
• Coexistence of topological and nontopological Fermi-superfluid phases
• Induced superfluidity of imbalanced Fermi gases near unitarity
• Ground states of atomic Fermi gases in a two-dimensional optical lattice with and without population imbalance
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• Enhanced Fulde-Ferrell-Larkin-Ovchinnikov and Sarma superfluid states near an orbital Feshbach resonance
• Bose-Hubbard model with occupation-parity couplings
• Trapped imbalanced fermionic superfluids in one dimension: A variational approach
• Damping of the Anderson-Bogolyubov mode by spin and mass imbalance in Fermi mixtures
• In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe${}_2$ homobilayers
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Superfluid-Normal Quantum Phase Transitions in an Imbalanced Fermi Gas
• Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
• The Gor'kov and Melik-Barkhudarov correction to the mean-field critical field transition to Fulde-Ferrell-Larkin-Ovchinnikov states
• Fulde-Ferrell states in unequally charged Fermi gases
• Topological Fulde-Ferrell Superfluids in Triangular Lattices
• Spectrum of density, spin and pairing fluctuations of an attractive two-dimensional Fermi gas
• Hybrid-pair superfluidity in a strongly driven Fermi gas
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses
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• Hierarchy of pairing in imbalanced three-component one-dimensional Fermi gas
• d_{xy}-Density wave in fermion-fermion cold atom mixtures
• Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry
• Vortex lattice in spin-imbalanced unitary Fermi gas
• Averaged collision and reaction rates in a two-species gas of ultracold fermions
• Quantum vortex dipole as a probe of the normal component distribution
• Effect of Population Imbalance on Vortex Mass in Superfluid Fermi Gases
• Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems
• Structures and proximity effects of inhomogeneous population-imbalanced Fermi gases with pairing interactions
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms
• Fulde-Ferrell superfluids in an asymmetric three-component Fermi Gas
• Novel dynamical excitations and roton-based measurement of Cooper-pair momentum in a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superfluid on optical lattices
• Odd-frequency superfluidity from a particle-number-conserving perspective