Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas

Wlazłowski, Gabriel; Magierski, Piotr; Drut, Joaquín E.; Bulgac, Aurel; Roche, Kenneth J.

doi:10.1103/physrevlett.110.090401

Title: Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas

Journal Article · Tue Feb 26 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.110.090401· OSTI ID:1565065

Wlazłowski, Gabriel ^[1]; Magierski, Piotr ^[1]; Drut, Joaquín E. ^[2]; Bulgac, Aurel ^[3]; Roche, Kenneth J. ^[4]

Warsaw Univ. of Technology, Warsaw (Poland). Faculty of Physics; Univ. of Washington, Seattle, WA (United States). Dept. of Physics
Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy
Univ. of Washington, Seattle, WA (United States). Dept. of Physics
Univ. of Washington, Seattle, WA (United States). Dept. of Physics; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

We present an ab initio determination of the spin response of the unitary Fermi gas. Based on finite temperature quantum Monte Carlo calculations and the Kubo linear-response formalism, we determine the temperature dependence of the spin susceptibility and the spin conductivity. We show that both quantities exhibit suppression above the critical temperature of the superfluid-to-normal phase transition due to Cooper pairing. The spin diffusion transport coefficient does not display a minimum in the vicinity of the critical temperature and drops to very low values $$D_s ≈ 0.8 ℏ/m$$ in the superfluid phase. All these spin observables show a smooth and monotonic behavior with temperature when crossing the critical temperature $$T_c$$, until the Fermi liquid regime is attained at the temperature $T^*$, above which the pseudogap regime disappears.

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Research Organization:: 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)

Grant/Contract Number:: AC05-00OR22725; FC02-07ER41457; FG02-97ER41014

OSTI ID:: 1565065

Alternate ID(s):: OSTI ID: 1102356

Journal Information:: Physical Review Letters, Vol. 110, Issue 9; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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