Viscosity-entropy ratio of the unitary Fermi gas from zero-temperature elementary excitations

Abstract

We investigate the low-temperature behavior of the ratio between the shear viscosity ηand the entropy density s in the unitary Fermi gas by using a model based on the zero-temperature spectra of both bosonic collective modes and fermonic single-particle excitations. Our theoretical curve of η/s as a function of the temperature T is in qualitative agreement with the experimental data of trapped ultracold 6Li atomic gases. We find the minimum value η/s \simeq 0.44 (in units of \hbar/k_B) at the temperature T/T_F \simeq 0.27, with T_F the Fermi temperature.

10 pages, 2 figures, prepared for the special issue "Correlations in Quantum Gases" of J. Low Temp, Phys

References in corpus (15)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Universal Quantum Viscosity in a Unitary Fermi Gas
• Universal Spin Transport in a Strongly Interacting Fermi Gas
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Viscosity and scale invariance in the unitary Fermi gas
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Thermodynamic Measurements in a Strongly Interacting Fermi Gas
• Shear viscosity of a superfluid Fermi gas in the unitarity limit
• Superfluid Bose-Fermi mixture from weak-coupling to unitarity
• Thermodynamics of a Trapped Unitary Fermi Gas
• DC Josephson Effect with Fermi gases in the Bose-Einstein regime
• Effective Nonlinear Schrödinger Equations for Cigar-Shaped and Disk-Shaped Fermi Superfluids at Unitarity
• Expansion of a Fermi Cloud in the BCS-BEC Crossover
• Hydrodynamics of Bose and Fermi superfluids at zero temperature: the superfluid nonlinear Schrodinger equation
• DC and AC Josephson effects with superfluid Fermi atoms across a Feshbach resonance

Cited by in corpus (16)

• Shear Viscosity of a Unitary Fermi Gas
• Pseudogap and preformed pairs in the imbalanced Fermi gas in two dimensions
• Shock waves in strongly interacting Fermi gas from time-dependent density functional calculations
• Three-phonon and four-phonon interaction processes in a pair-condensed Fermi gas
• Shear viscosity of nucleonic matter
• Perfect-fluid behavior of a dilute Fermi gas near unitary
• Phonon contribution to the shear viscosity of a superfluid Fermi gas in the unitarity limit
• Shear viscosity and Strong-Coupling Corrections in the BCS-BEC crossover Regime of an Ultracold Fermi Gas
• Dynamical properties of the unitary Fermi gas: collective modes and shock waves
• Viscosity Bound Violation in Viscoelastic Fermi Liquids
• Critical velocity, vortex shedding and drag in a unitary Fermi superfluid
• Dispersive effects in the unitary Fermi gas
• Unitary Fermi superfluid near the critical temperature: thermodynamics and sound modes from elementary excitations
• Kovtun-Son-Starinets Conjecture and Effects of Mass Imbalance in the Normal State of an Ultracold Fermi Gas in the BCS-BEC Crossover Region
• Thermal and transport properties of a non-relativistic quantum gas interacting through a delta-shell potential
• Anomalous dispersion of the collective modes of an ultracold ${}^{6}Li-$ ${}^{40}K$ mixture in a square optical lattice