Pair correlations in the normal phase of an attractive Fermi gas
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.
- Publication:
-
New Journal of Physics
- Pub Date:
- August 2020
- DOI:
- 10.1088/1367-2630/ab9ee3
- arXiv:
- arXiv:1912.04802
- Bibcode:
- 2020NJPh...22h3008P
- Keywords:
-
- superfluid Fermi gases;
- pairing correlations;
- preformed pairs;
- Condensed Matter - Quantum Gases;
- Condensed Matter - Superconductivity
- E-Print:
- 16 pages, 11 figures