Shear Viscosity in the Strong Interaction Regime of a p-wave Superfluid Fermi Gas

TL;DR

This paper investigates the shear viscosity of a strongly coupled p-wave superfluid Fermi gas at low temperatures, revealing how anisotropic pairing influences its transport properties in the strong interaction regime.

Contribution

It provides a detailed calculation of shear viscosity and relaxation rates in the strong-coupling limit, considering p-wave pairing anisotropy, which was not previously analyzed.

Findings

Viscosity behavior differs from s-wave superfluids due to anisotropic pairing.

Temperature dependence of relaxation rates is uniquely affected by p-wave interactions.

Results enhance understanding of transport in unconventional superfluid Fermi gases.

Abstract

The $p$-wave superfluid state is a promising spin-triplet and non $s$-wave pairing state in an ultracold Fermi gas. In this work we study the low-temperature shear viscosity of a one-component $p$-wave superfluid Fermi gas, by means of Kubo formalism. Our study is done in the strong-coupling limit where Fermi superfluid reduces into a system of composite bosons. Taking into account ${{p}_{x}}$-wave Cooper channel in the self-energy, the viscous relaxation rates are determined. The relaxation rates related to these interactions are calculated as a function of temperature. Their temperature dependence is different from the $s$-wave superfluid Fermi gas, and this is due to the anisotropic pairing interaction in the $p$-wave superfluid. Our results contribute to understand how this anisotropy affects transport properties of this unconventional superfluid Fermi gas in low temperature limit.