We calculate the pair susceptibility of an attractive spin-polarized Fermi gas in the normal phase, as a function of the pair momentum. Close to unitarity, we find a strong enhancement of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing fluctuations over an extended region of the temperature-polarization phase diagram, which manifests itself as a pronounced peak in the pair-momentum distribution at a finite pair momentum. This peak should be amenable to experimental observation at achievable temperatures in a boxlike trapping potential, as a fingerprint of FFLO pairing. Our calculations rest on a self-consistent t-matrix approach which, for the unitary balanced Fermi gas, has been validated against experimental data for several thermodynamic quantities.

M. Pini, P.P. (2021). Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems. PHYSICAL REVIEW RESEARCH, 3(4), 1-10 [10.1103/PhysRevResearch.3.043068].

Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems

P. Pieri
;
2021

Abstract

We calculate the pair susceptibility of an attractive spin-polarized Fermi gas in the normal phase, as a function of the pair momentum. Close to unitarity, we find a strong enhancement of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing fluctuations over an extended region of the temperature-polarization phase diagram, which manifests itself as a pronounced peak in the pair-momentum distribution at a finite pair momentum. This peak should be amenable to experimental observation at achievable temperatures in a boxlike trapping potential, as a fingerprint of FFLO pairing. Our calculations rest on a self-consistent t-matrix approach which, for the unitary balanced Fermi gas, has been validated against experimental data for several thermodynamic quantities.
2021
M. Pini, P.P. (2021). Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems. PHYSICAL REVIEW RESEARCH, 3(4), 1-10 [10.1103/PhysRevResearch.3.043068].
M. Pini, P. Pieri, G. Calvanese Strinati
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/839506
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