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.

arXiv comment9 pages; v2: references and comparison with more recent experimental data added; v3: reference added and minor corrections

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Cited by in corpus (17)

• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• $T$-matrix Approach to Quark-Gluon Plasma
• Pairing correlations across the superfluid phase transition in the unitary Fermi gas
• Emergence of a pseudogap in the BCS-BEC crossover
• The pseudogap regime in the unitary Fermi gas
• Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
• Mesoscopic spin transport between strongly interacting Fermi gases
• Strong-coupling corrections to spin susceptibility in the BCS-BEC crossover regime of a superfluid Fermi gas
• 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
• Application of renormalized RPA to polarized Fermi gases
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• Low-energy modes of spin-imbalanced Fermi gases in BCS phase
• Two-dimensional spin-imbalanced Fermi gases at non-zero temperature: Phase separation of a non-condensate
• A lattice pairing-field approach to ultracold Fermi gases