Finite-Temperature Behavior of an Inter-species Fermionic Superfluid with Population Imbalance

Abstract

We determine the superfluid transition temperature $T_c$ and related finite temperature phase diagrams for the entire BCS-Bose Einstein condensation crossover in a homogeneous mixture of ${}^6$Li and ${}^{40}$K atoms with population imbalance. Our work is motivated by the recent observation of an inter-species Feshbach resonance. Pairing fluctuation effects, which significantly reduce $T_c$ from the onset temperature for pairing ($T^{\ast }$), provide reasonable estimates of $T_c$ and indicate that the inter-species superfluid phase should be accessible in future experiments. Although a generalized-Sarma phase is not stable in the ground state near unitarity, our phase diagrams show that it appears as an intermediate-temperature superfluid.

4 pages, 4 figures

References in corpus (21)

• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Phase diagram of a two-component Fermi gas with resonant interactions
• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Phase separation in a polarized Fermi gas at zero temperature
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Two-species fermion mixtures with population imbalance
• Exact quantum Monte Carlo study of one dimensional trapped fermions with attractive contact interactions
• Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates
• Trapped Fermions across a Feshbach resonance with population imbalance
• Polarized Fermi condensates with unequal masses: Tuning the tricritical point
• Intermediate temperature superfluidity in an atomic Fermi gas with population imbalance
• FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
• Resonant pairing between Fermions with unequal masses
• Mixtures of ultracold fermions with unequal masses
• Fermi-Fermi Mixtures in the Strong Attraction Limit
• Stability conditions and phase diagrams for two component Fermi gases with population imbalance
• Single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrell state in BCS--Bose-Einstein condensation crossover
• Pair formation and collapse in imbalanced Fermion populations with unequal masses
• Asymmetric Fermi superfluid with different atomic species in a harmonic trap

Cited by in corpus (19)

• Heavy-Light Fermion Mixtures at Unitarity
• Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases
• Pseudogap phenomena in ultracold atomic Fermi gases
• One-particle density matrix of a trapped Lieb-Liniger anyonic gas
• Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
• Ground states and dynamics of population-imbalanced Fermi condensates in one dimension
• Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice
• Population imbalanced lattice fermions near the BCS-BEC crossover: II. The FFLO regime and its thermal signatures
• Strong coupling s-wave superconductors in the extreme Pauli limit: I.The breached pair and metastable FFLO phases
• Population imbalanced lattice fermions near the BCS-BEC crossover: I.The breached pair and metastable FFLO phases
• Phase diagrams of Fermi gases in a trap with mass and population imbalances at finite temperature
• Thermal transitions, pseudogap behavior and BCS-BEC crossover in Fermi-Fermi mixtures
• BCS-BEC Crossover in Mix-dimensional Fermi Gases
• Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
• Pauli limited d-wave superconductors: Quantum breached pair phase and thermal transitions
• Determinant formula for the field form factor in the anyonic Lieb-Liniger model
• Mass-imbalanced Fermi gases with spin-orbit coupling
• Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice
• Ultra high temperature superfluidity in ultracold atomic Fermi gases with mixed dimensionality