Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase

Abstract

We theoretically study the pairing behavior of the unitary Fermi gas in the normal phase. Our analysis is based on the static spin susceptibility, which characterizes the response to an external magnetic field. We obtain this quantity by means of the complex Langevin approach and compare our calculations to available literature data in the spin-balanced case. Furthermore, we present results for polarized systems, where we complement and expand our analysis at high temperature with high-order virial expansion results. The implications of our findings for the phase diagram of the spin-polarized unitary Fermi gas are discussed, in the context of the state of the art.

arXiv comment8 pages, 3 figures (published version)

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• Evolution of an attractive polarized Fermi gas: From a Fermi liquid of polarons to a non-Fermi liquid at the Fulde-Ferrell-Larkin-Ovchinnikov quantum critical point
• Pairing patterns in polarized unitary Fermi gases above the superfluid transition
• Fourth- and fifth-order virial expansion of harmonically trapped fermions at unitarity
• Stability of the Fulde-Ferrell-Larkin-Ovchinnikov states in anisotropic systems and critical behavior at thermal $m$-axial Lifshitz points
• Complex Langevin study for polarons in an attractively interacting one-dimensional two-component Fermi gas
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
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• Toward an automated-algebra framework for high orders in the virial expansion of quantum matter
• A lattice pairing-field approach to ultracold Fermi gases
• Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems