Polarized Fermi gases at finite temperature in the BCS-BEC crossover

Abstract

We consider a polarized Fermi gas in the BCS-BEC crossover region above the critical temperature within a T matrix formalism. By treating the mean-field like shift of the quasiparticle energies in a self-consistent manner, we avoid the known pathological behavior of the standard Nozieres-Schmitt-Rink approach in the polarized case, i.e., the polarization has the right sign and the spin polarizability is positive. The momentum distributions of the correlated system are computed and it is shown that, in the zero-temperature limit, they satisfy the Luttinger theorem. Results for the phase diagram, the spin susceptibility, and the compressibility are discussed.

9 pages; v2: references and comparison with more recent experimental data added; v3: reference added and minor corrections

References in corpus (10)

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• Thermodynamics of the BCS-BEC crossover
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Cited by in corpus (7)

• Numerical solution of the Boltzmann equation for trapped Fermi gases with in-medium effects
• Non-equilibrium strong-coupling theory for a driven-dissipative ultracold Fermi gas in the BCS-BEC crossover region
• Feasibility of a Fulde-Ferrell-Larkin-Ovchinnikov superfluid Fermi atomic gas
• BCS-BEC Crossover Effects and Pseudogap in Neutron Matter
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• Low-energy modes of spin-imbalanced Fermi gases in BCS phase
• A lattice pairing-field approach to ultracold Fermi gases