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Scattering mechanisms, relaxation times, and shear viscosity in universal anomalous transport of unitary Fermi gases by Zhou, Hang ;Dong, Hang ;Ma, Yongli is a Physics and Astronomy article available to read on EtoBox.

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In this paper we investigate the scattering mechanisms of viscous momentum transport in unitary Fermi gases below the pseudogap temperature T \* by opening almost all the elastic and inelastic scattering channels. For a given system Hamiltonian, we adopt a microscopic t-matrix approximation to determine the thermodynamical quantities, and we approach an equivalent three-fluid dynamics to calculate the viscous relaxation time τ by two kinds of elementary excitations. The exotic scattering processes raised by uncondensed Fermi pairs greatly decay τ and lead to a universal behavior of τ with temperature, which is closely related to the anomalous transport in a wide range of strongly correlated systems. For linking our findings of τ to the shear viscosity η, we present a Kubo-based expression of η by the stress-tensor correlation function with conserved vertex corrections, and we give an approximate relation for a possible experimental determination of τ . Our results fit well with measurements and are comparable with other theories. Moreover, we verify the newly proposed universal upper bound of the ratio of η and entropy density s in unitary Fermi gases.

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Author

Zhou, Hang ;Dong, Hang ;Ma, Yongli

Publisher

American Physical Society (APS)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)