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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.
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Contributor : Sophie Heurteau Connect in order to contact the contributor
Submitted on : Thursday, September 18, 2014 - 11:06:27 AM
Last modification on : Friday, September 10, 2021 - 1:50:13 PM

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P. A. Pantel, D. Davesne, Michael Urban. Polarized Fermi gases at finite temperature in the BCS-BEC crossover. Physical Review A, American Physical Society, 2014, 90, pp.053629. ⟨10.1103/PhysRevA.90.053629⟩. ⟨in2p3-01065508⟩



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