Intermediate temperature superfluidity in an atomic Fermi gas with population imbalance

Abstract

We derive the underlying finite temperature theory which describes Fermi gas superfluidity with population imbalance in a homogeneous system. We compute the pair formation temperature and superfluid transition temperature $T_c$ and superfluid density in a manner consistent with the standard ground state equations, and thereby present a complete phase diagram. Finite temperature stabilizes superfluidity, as manifested by two solutions for $T_c$, or by low $T$ instabilities. At unitarity the polarized state is an ``intermediate temperature superfluid".

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• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
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• Theory of Superfluids with Population Imbalance: Finite Temperature and BCS-BEC Crossover Effects
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• Quantum liquid-crystal order in resonant atomic gases
• Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
• Asymmetric Fermi superfluid with different atomic species in a harmonic trap
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• Superfluidity in atomic Fermi gases
• Anomalous pseudogap in population imbalanced Fermi superfluids
• The Gor'kov and Melik-Barkhudarov correction to the mean-field critical field transition to Fulde-Ferrell-Larkin-Ovchinnikov states
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• Pair condensation of polarized fermions in the BCS-BEC crossover
• Quantum phase transitions in superconductor--quantum-dot--superconductor Josephson structures with attractive intradot interaction
• Structures and proximity effects of inhomogeneous population-imbalanced Fermi gases with pairing interactions