Universal Drude Weights in One-dimensional Repulsive Fermi Gas
This work rigorously establishes universal relations between charge, spin, and energy transport (Drude weights) and thermodynamic properties for a one-dimensional repulsive Fermi gas (Yang-Gaudin model). The authors use generalized hydrodynamics and integral representations to derive that charge transport is ballistic, linking Drude weights directly to particle density, magnetization, temperature, and entropy.