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.

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

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• Accurate Determination of the Dynamical Polarizability of Dysprosium
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• 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
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• A strongly interacting Sarma superfluid near orbital Feshbach resonances
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• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
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• 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