Viscous Drude weight of dual Bose and Fermi gases in one dimension

TL;DR

This paper investigates the frequency-dependent bulk viscosities of one-dimensional Bose and Fermi gases, revealing divergent Drude peaks at zero frequency and calculating their weights across various regimes.

Contribution

It provides a systematic evaluation of the Drude weights for these gases in high-temperature, weak-coupling, and strong-coupling limits using the Kubo formula.

Findings

Drude peaks diverge at zero frequency in these systems.

Drude weights are computed in multiple regimes, showing higher-order divergence.

Systematic expansions are used for arbitrary coupling and temperature.

Abstract

We continue to study frequency-dependent complex bulk viscosities of one-dimensional Bose and Fermi gases with contact interactions, which exhibit the weak-strong duality according to our recent work. Here we show that they are contributed to by Drude peaks divergent at zero frequency as typical for transport coefficients of quantum integrable systems in one dimension. In particular, their Drude weights are evaluated based on the Kubo formula in the high-temperature limit at arbitrary coupling as well as in the weak-coupling and strong-coupling limits at arbitrary temperature, where systematic expansions in terms of small parameters are available. In all three limits, the Drude peaks are found at higher orders compared to the finite regular parts.