Shear Viscosity of a Unitary Fermi Gas

Abstract

We present the first ab initio determination of the shear viscosity eta 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 shear viscosity to entropy density ratio eta/s. The minimum of eta/s appears to be located above the critical temperature for the superfluid-to-normal phase transition with the most probable value being eta/s approx 0.2 hbar/kB, which almost saturates the Kovtun-Son-Starinets universal value hbar/(4 pi kB).

8 pages, 9 figures; supplemental materials included

References in corpus (16)

• Many-Body Physics with Ultracold Gases
• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Theory of ultracold Fermi gases
• A calculation of the bulk viscosity in SU(3) gluodynamics
• Nonrelativistic conformal field theories
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Viscosity and scale invariance in the unitary Fermi gas
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Finite Temperature Spectral Densities of Momentum and R-Charge Correlators in $\mathbb{N}=4$ Yang Mills Theory
• The Shear Viscosity to Entropy Density Ratio of Trapped Fermions in the Unitarity Limit
• Shear viscosity of a superfluid Fermi gas in the unitarity limit
• Shear viscosity and damping for a Fermi gas in the unitarity limit
• Momentum Distribution and Contact of the Unitary Fermi gas
• Is a gas of strongly interacting atomic fermions a nearly perfect fluid?
• Microscopic Approach to Shear Viscosities in Superfluid Gases: From BCS to BEC
• Improved lattice operators for non-relativistic fermions

Cited by in corpus (9)

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• Shear viscosity of a universal Fermi gas near the superfluid phase transition
• Cooper pairing above the critical temperature in a unitary Fermi gas
• Hydrodynamic fluctuations and the minimum shear viscosity of the dilute Fermi gas at unitarity
• Visualizing the BEC-BCS crossover in the two-dimensional Fermi gas: pairing gaps and dynamical response functions from ab initio computations
• Second order fluid dynamics for the unitary Fermi gas from kinetic theory
• Universal Density Shift Coefficients for the Thermal Conductivity and Shear Viscosity of a Unitary Fermi Gas
• On the Gravitational Wave to Matter Coupling of Superfluid Fermi Gases Near Unitarity
• Extreme dynamics and relaxation of quantum gases: A hydrodynamic approach