Generic Phase Diagram of Fermion Superfluids with Population Imbalance

Abstract

It is shown by microscopic calculations for trapped imbalanced Fermi superfluids that the gap function has always sign changes, i.e., the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state like, up to a critical imbalance $P_c$, beyond which normal state becomes stable, at temperature T=0. A phase diagram is constructed in $T$ vs $P$, where the BCS state without sign change is stable only at $T\ne 0$. We reproduce the observed bimodality in the density profile to identify its origin and evaluate $P_c$ as functions of $T$ and the coupling strength. These dependencies match with the recent experiments.

5 pages, 5 figures, replaced by the version to appear in PRL

References in corpus (5)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
• Phase diagram of a cold polarized Fermi gas
• Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
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Cited by in corpus (35)

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• Exact Numerical Study of Pair Formation with Imbalanced Fermion Populations
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Larkin-Ovchinnikov state in resonant Fermi gas
• FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
• Finite temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
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• Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders
• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
• The role of interactions in spin-polarised atomic Fermi gases at unitarity
• Cold Attractive Spin Polarized Fermi Lattice Gases and the Doped Positive U Hubbard Model
• Vortex state in a Fulde-Ferrell-Larkin-Ovchinnikov superconductor based on the quasiclassical theory
• Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps
• Imbalanced Fermi superfluid in a one-dimensional optical potential
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Normal-Superfluid Interface Scattering For Polarized Fermion Gases
• Pair formation and collapse in imbalanced Fermion populations with unequal masses
• Vortex Core Structure in Neutral Fermion Superfluids with Population Imbalance
• Non-BCS superfluidity in trapped ultracold Fermi gases
• Finite temperature phase diagram of trapped Fermi gases with population imbalance
• Stable Sarma State in Two-band Fermi Systems
• Imbalanced d-wave superfluids in the BCS-BEC crossover regime at finite temperatures
• Higgs instability in gapless superfluidity/superconductivity
• Temperature Effects in a Fermi Gas with Population Imbalance
• Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for anisotropic s-wave pairing
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• Magnetization profile and core level spectroscopy in a multiply quantized vortex of imbalanced Fermi superfluids
• Asymmetric Fermion Superfluid with Inter- and Intra-Species Pairings
• Asymmetric Fermi Superfluid With Two Types Of Pairings
• Flow and critical velocity of an imbalanced Fermi gas through an optical potential