Eur. Phys. J. Special Topics 227, 2241–2261 (2019)
https://doi.org/10.1140/epjst/e2019-800105-y

Review

The pseudogap regime in the unitary Fermi gas

¹ Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520, USA
² Institute for Nuclear Theory, Box 351550, University of Washington, Seattle, WA 98195, USA

^a e-mail: scott.jensen@yale.edu
^b e-mail: christopher.gilbreth@gmail.com
^d e-mail: yoram.alhassid@yale.edu

Received: 25 June 2018
Received in final form: 14 December 2018
Published online: 5 March 2019

Abstract

We discuss the pseudogap regime in the unitary Fermi gas (UFG), with a particular emphasis on the auxiliary-field quantum Monte Carlo (AFMC) approach. We discuss possible signatures of the pseudogap, review experimental results, and survey analytic and quantum Monte Carlo techniques before focusing on AFMC calculations in the canonical ensemble. For the latter method, we discuss results for the heat capacity, condensate fraction, energy-staggering pairing gap, and spin susceptibility, and compare to experiment and results of other theoretical methods.