Temperature evolution of the shear viscosity in a unitary Fermi gas
Abstract
In this paper, we present an ab initio determination of the shear viscosity for the unitary Fermi gas based on finite temperature quantum Monte Carlo (QMC) calculations and the Kubo linear-response formalism. The results are confronted with the bound for the shear viscosity originating from hydrodynamic fluctuations. Assuming smoothness of the frequency dependent shear viscosity $η(ω)$, we show that the bound is violated in the low temperature regime and the violation occurs simultaneously with the onset of the Cooper pairing in the system. In order to preserve the hydrodynamic bound in QMC $η(ω)$ has to possess a sharp structure located in the vicinity of zero frequency which is not resolved by an analytic continuation procedure.
- Authors:
-
- Warsaw Univ. of Technology, Warsaw (Poland). Faculty of Physics; Univ. of Washington, Seattle, WA (United States). Dept. of Physics
- 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)
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1565035
- Alternate Identifier(s):
- OSTI ID: 1104347
- Grant/Contract Number:
- AC05-00OR22725; FC02-07ER41457; FG02-97ER41014
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review A - Atomic, Molecular, and Optical Physics
- Additional Journal Information:
- Journal Volume: 88; Journal Issue: 1; Journal ID: ISSN 1050-2947
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; optics; physics
Citation Formats
Wlazłowski, Gabriel, Magierski, Piotr, Bulgac, Aurel, and Roche, Kenneth J. Temperature evolution of the shear viscosity in a unitary Fermi gas. United States: N. p., 2013.
Web. doi:10.1103/physreva.88.013639.
Wlazłowski, Gabriel, Magierski, Piotr, Bulgac, Aurel, & Roche, Kenneth J. Temperature evolution of the shear viscosity in a unitary Fermi gas. United States. https://doi.org/10.1103/physreva.88.013639
Wlazłowski, Gabriel, Magierski, Piotr, Bulgac, Aurel, and Roche, Kenneth J. Wed .
"Temperature evolution of the shear viscosity in a unitary Fermi gas". United States. https://doi.org/10.1103/physreva.88.013639. https://www.osti.gov/servlets/purl/1565035.
@article{osti_1565035,
title = {Temperature evolution of the shear viscosity in a unitary Fermi gas},
author = {Wlazłowski, Gabriel and Magierski, Piotr and Bulgac, Aurel and Roche, Kenneth J.},
abstractNote = {In this paper, we present an ab initio determination of the shear viscosity for the unitary Fermi gas based on finite temperature quantum Monte Carlo (QMC) calculations and the Kubo linear-response formalism. The results are confronted with the bound for the shear viscosity originating from hydrodynamic fluctuations. Assuming smoothness of the frequency dependent shear viscosity $η(ω)$, we show that the bound is violated in the low temperature regime and the violation occurs simultaneously with the onset of the Cooper pairing in the system. In order to preserve the hydrodynamic bound in QMC $η(ω)$ has to possess a sharp structure located in the vicinity of zero frequency which is not resolved by an analytic continuation procedure.},
doi = {10.1103/physreva.88.013639},
journal = {Physical Review A - Atomic, Molecular, and Optical Physics},
number = 1,
volume = 88,
place = {United States},
year = {Wed Jul 31 00:00:00 EDT 2013},
month = {Wed Jul 31 00:00:00 EDT 2013}
}
Web of Science
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