Pair correlations in the normal phase of an attractive Fermi gas

Year: 2020

Authors: Pini M., Pieri P., Jager M., Denschlag JH., Strinati Calvanese G.

Autors Affiliation: Univ Camerino, Phys Div, Sch Sci & Technol, I-62032 Camerino, MC, Italy; INFN, Sez Perugia, I-06123 Perugia, PG, Italy; Univ Ulm, Inst Quantenmaterie, D-89069 Ulm, Germany; Univ Ulm, Ctr Integrated Quantum Sci & Technol IQST, D-89069 Ulm, Germany; CNR, INO, Ist Nazl Ott, I-50125 Sede Di Firenze, FI, Italy

Abstract: In a recent paper (2019 Phys. Rev. A 99, 053617), the total number of fermion pairs in a spin-balanced two-component Fermi gas of 6Li atoms was experimentally probed in the normal phase above the superfluid critical temperature, in order to investigate the sectors of pseudogap and preformed-pair in the temperature-coupling phase diagram. Here, we present a theoretical account of these experimental results in terms of an ab initio self-consistent t-matrix calculation, which emphasizes the role of the pair-correlation function between opposite-spin fermions at equilibrium. Good agreement is found between the available experimental data and the theoretical results obtained with no adjustable parameter.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 22 (8)      Pages from: 083008-1  to: 083008-21

More Information: MP, PP, and GCS acknowledge financial support from the Italian MIUR under Projects PRIN2015 (2015C5SEJJ001) and PRIN2017 (CEnTraL 20172H2SC4). MJ and JHD acknowledge financial support from DFG (LI988/6-1), and thank W Limmer, T Paintner and D Hoffmann for discussions.
KeyWords: superfluid Fermi gases; pairing correlations; preformed pairs
DOI: 10.1088/1367-2630/ab9ee3

Citations: 12
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