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

Year: 2021

Authors: Pini M.; Pieri P.; Calvanese Strinati G.

Autors Affiliation: Univ Camerino, Sch Sci & Technol, Phys Div, I-62032 Carnerino, MC, Italy; Ist Nazl Ottica, Sede Sesto Fiorentino, CNR INO, I-50019 Sesto Fiorentino, FI, Italy; Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, BO, Italy; Ist Nazl Fis Nucl, Sez Bologna, I-40127 Bologna, BO, Italy; Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, PG, Italy; Ist Nazl Ottica, CNR INO, Sede Firenze, I-50125 Florence, FI, Italy.

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.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 3 (4)      Pages from: 043068-1  to: 043068-10

More Information: Financial support from the Italian MIUR under Project PRIN2017 (20172H2SC4) is acknowledged.
KeyWords: BCS superconductivity; density-wave; Bose-condensation; phase-diagram; transition; evolution; state; gas
DOI: 10.1103/PhysRevResearch.3.043068

Citations: 5
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