Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases

Abstract

Ultracold two-component Fermi gases with a tunable population imbalance have provided an excellent opportunity for studying the exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, which have been of great interest in condensed matter physics. However, the FFLO states have not been observed experimentally in Fermi gases in three dimensions (3D), possibly due to their small phase space volume and extremely low temperature required for an equal-mass Fermi gas. Here we explore possible effects of mass imbalance, mainly in a ${}^6$Li--${}^{40}$K mixture, on the one-plane-wave FFLO phases for a 3D homogeneous case at the mean-field level. We present various phase diagrams related to the FFLO states at both zero and finite temperatures, throughout the BCS-BEC crossover, and show that a large mass ratio may enhance substantially FFLO type of pairing.

arXiv commentMajor revision from previous version. (5 pages, 4 figures in color)

References in corpus (59)

• Many-Body Physics with Ultracold Gases
• Pairing and Phase Separation in a Polarized Fermi Gas
• Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
• Bose-Einstein condensation of atoms in a uniform potential
• BCS-BEC Crossover: From High Temperature Superconductors to Ultracold Superfluids
• Inhomogeneous Superconductivity in Condensed Matter and QCD
• Spin-Imbalance in a One-Dimensional Fermi Gas
• Crystalline Color Superconductivity
• Phase diagram of a two-component Fermi gas with resonant interactions
• BEC-BCS crossover in "magnetized" Feshbach-resonantly paired superfluids
• Degenerate Fermi Gases of Ytterbium
• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
• First order superconducting phase transition in CeCoIn${}_5$
• Imbalanced Feshbach-resonant Fermi gases
• Direct Imaging of Spatially Modulated Superfluid Phases in Atomic Fermion Systems
• Superfluid stability in BEC-BCS crossover
• Strongly interacting Fermi gases with density imbalance
• Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
• Anisotropic upper critical field and a possible Fulde-Ferrel-Larkin-Ovchinnikov state in a stoichiometric pnictide superconductor LiFeAs
• Generic Phase Diagram of Fermion Superfluids with Population Imbalance
• Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields
• Pairing in a two-component ultracold Fermi gas: phases with broken space symmetries
• Phase Diagram and Spectroscopy of FFLO states of two-dimensional d-wave superconductors
• Route to Observable Fulde-Ferrell-Larkin-Ovchinnikov Phases in 3D Spin-Orbit Coupled Degenerate Fermi Gases
• Larkin-Ovchinnikov state in resonant Fermi gas
• Intermediate temperature superfluidity in an atomic Fermi gas with population imbalance
• Population and mass imbalance in atomic Fermi gases
• Feshbach resonances in the 6Li-40K Fermi-Fermi mixture: Elastic versus inelastic interactions
• Superfluid phase diagrams of trapped Fermi gases with population imbalance
• Gapless topological Fulde-Ferrell superfluidity in spin-orbit coupled Fermi gases
• Fulde-Ferrell Pairing instability in Spin-Orbit Coupled Fermi Gas
• Production of quantum degenerate mixtures of ytterbium and lithium with controllable inter-species overlap
• Spectral signatures of the Fulde-Ferrell-Larkin-Ovchinnikov order parameter in one-dimensional optical lattices
• Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in 2D and 3D optical lattices
• Lifshitz Point in the Phase Diagram of Resonantly Interacting ${}^{6}Li$-${}^{40}K$ Mixtures
• Inhomogeneous Fulde-Ferrell superfluidity in spin-orbit coupled atomic Fermi gases
• Signature of the FFLO phase in the collective modes of a trapped ultracold Fermi gas
• Finite Temperature Phase Diagram of a Two-Component Fermi Gas with Density Imbalance
• Stability conditions and phase diagrams for two component Fermi gases with population imbalance
• Phases of asymmetric nuclear matter with broken space symmetries
• Single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrell state in BCS--Bose-Einstein condensation crossover
• Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling
• Spin-orbit coupling induced Fulde-Ferrell-Larkin-Ovchinnikov-like Cooper pairing and skyrmion-like polarization textures in trapped optical lattices
• Fulde-Ferrell-Larkin-Ovchinnikov critical polarization in one-dimensional fermionic optical lattices
• Asymmetric Fermi superfluid with different atomic species in a harmonic trap
• Finite temperature phase diagram of trapped Fermi gases with population imbalance
• Finite-Temperature Behavior of an Inter-species Fermionic Superfluid with Population Imbalance
• Fulde-Ferrell superfluidity in ultracold Fermi gases with Rashba spin-orbit coupling
• Fulde-Ferrell--Larkin-Ovchinnikov state in the dimensional crossover between one- and three-dimensional lattices
• Transition to the Fulde-Ferrel-Larkin-Ovchinnikov planar phase : a quasiclassical investigation with Fourier expansion
• Phase diagrams of Fermi gases in a trap with mass and population imbalances at finite temperature
• Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
• Pure Fulde-Ferrell-Larkin-Ovchinnikov state in optical lattices
• Effect of the particle-hole channel on BCS--Bose-Einstein condensation crossover in atomic Fermi gases
• Triplet pair correlations in {\it s-}wave superfluids as a signature of the FFLO state
• Stability of FFLO states in optical lattices with bilayer structure
• Inhomogeneous magnetic phases: a LOFF-like phase in Sr3Ru2O7
• Spatial line nodes and fractional vortex pairs in the Fulde-Ferrell-Larkin-Ovchinnikov phase

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• Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms
• Accurate Determination of the Dynamical Polarizability of Dysprosium
• Quantum mixtures of ultracold gases of neutral atoms
• Resonantly Interacting Fermi-Fermi Mixture of ${}^{161}$Dy and ${}^{40}$K
• Experimental conditions for observation of electron-hole superfluidity in GaAs heterostructures
• Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
• Critical behaviour in one dimension: unconventional pairing, phase separation, BEC-BCS crossover and magnetic Lifshitz transition
• Beyond-mean-field description of a trapped unitary Fermi gas with mass and population imbalance
• A strongly interacting Sarma superfluid near orbital Feshbach resonances
• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
• Observation of Feshbach resonances in an ${}^{167}$Er-${}^6$Li Fermi-Fermi mixture
• Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
• Optically trapped Feshbach molecules of fermionic 161Dy and 40K
• Collective mode contributions to the Meissner effect: Fulde-Ferrell and pair-density wave superfluids
• Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line
• Superfluidity and pairing phenomena in ultracold atomic Fermi gases in one-dimensional optical lattices, Part II: Effects of population imbalance
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Broad Feshbach resonance with a large background scattering length in a fermionic atom-molecule mixture
• In-medium bound-state formation and inhomogeneous condensation in Fermi gases in a hard-wall box
• The Gor'kov and Melik-Barkhudarov correction to the mean-field critical field transition to Fulde-Ferrell-Larkin-Ovchinnikov states
• BCS-BEC crossover of the strongly interacting ${}^6$Li-${}^{40}$K mixture
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses
• Interplay of mass imbalance and frustration in correlated band insulators
• Low-field Feshbach resonances and three-body losses in a fermionic quantum gas of ${}^{161}$Dy
• Temporal fluctuation induced order in conventional superconductors
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms