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arXiv · 2105.00863

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

M. Pini·P. Pieri·G. Calvanese Strinati
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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 box-like 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.

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M. Pini, P. Pieri, G. Calvanese Strinati. 2021-05-03. Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems. https://doi.org/10.1103/physrevresearch.3.043068

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