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

Abstract

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.

Authors:
 [1];  [1];  [2];  [3];  [4]
  1. Warsaw Univ. of Technology, Warsaw (Poland). Faculty of Physics; Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  2. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy
  3. Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  4. Univ. of Washington, Seattle, WA (United States). Dept. of Physics; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Univ. of Washington, Seattle, WA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565065
Alternate Identifier(s):
OSTI ID: 1102356
Grant/Contract Number:  
AC05-00OR22725; FC02-07ER41457; FG02-97ER41014
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 110; Journal Issue: 9; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics

Citation Formats

Wlazłowski, Gabriel, Magierski, Piotr, Drut, Joaquín E., Bulgac, Aurel, and Roche, Kenneth J. Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas. United States: N. p., 2013. Web. doi:10.1103/physrevlett.110.090401.
Wlazłowski, Gabriel, Magierski, Piotr, Drut, Joaquín E., Bulgac, Aurel, & Roche, Kenneth J. Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas. United States. doi:10.1103/physrevlett.110.090401.
Wlazłowski, Gabriel, Magierski, Piotr, Drut, Joaquín E., Bulgac, Aurel, and Roche, Kenneth J. Tue . "Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas". United States. doi:10.1103/physrevlett.110.090401. https://www.osti.gov/servlets/purl/1565065.
@article{osti_1565065,
title = {Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas},
author = {Wlazłowski, Gabriel and Magierski, Piotr and Drut, Joaquín E. and Bulgac, Aurel and Roche, Kenneth J.},
abstractNote = {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.},
doi = {10.1103/physrevlett.110.090401},
journal = {Physical Review Letters},
number = 9,
volume = 110,
place = {United States},
year = {2013},
month = {2}
}

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Cited by: 22 works
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