Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems
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.
Keywords
Cite
@article{arxiv.2105.00863,
title = {Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems},
author = {M. Pini and P. Pieri and G. Calvanese Strinati},
journal= {arXiv preprint arXiv:2105.00863},
year = {2021}
}
Comments
11 pages, 7 figures; includes calculations for a realistic box-like trapping potential