Emergence of a Pseudogap in the BCS-BEC Crossover

Richie-Halford, Adam; Drut, Joaquín E.; Drut, Joaquín E.

doi:10.1103/physrevlett.125.060403

Title: Emergence of a Pseudogap in the BCS-BEC Crossover

Journal Article · Tue Aug 04 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.060403· OSTI ID:1800919

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Univ. of Washington, Seattle, WA (United States)
Univ. of North Carolina, Chapel Hill, NC (United States)

Strongly correlated Fermi systems with pairing interactions become superfluid below a critical temperature $$T_c$$. The extent to which such pairing correlations alter the behavior of the liquid at temperatures $$T > T_c$$ is a subtle issue that remains an area of debate, in particular regarding the appearance of the so-called pseudogap in the BCS-BEC crossover of unpolarized spin-1/2 nonrelativistic matter. To shed light on this, in this work we extract several quantities of crucial importance at and around the unitary limit, namely, the odd-even staggering of the total energy, the spin susceptibility, the pairing correlation function, the condensate fraction, and the critical temperature $$T_c$$, using a nonperturbative, constrained-ensemble quantum Monte Carlo algorithm.

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Research Organization:: Krell Institute, Ames, IA (United States); Univ. of Washington, Seattle, WA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: FG02-97ER25308; FG02-97ER41014; AC05-00OR22725; PHY1452635

OSTI ID:: 1800919

Journal Information:: Physical Review Letters, Vol. 125, Issue 6; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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