On the finite temperature Drude weight of the anisotropic Heisenberg chain

J. Benz, T. Fukui, A. Klümper +1

We present a study of the Drude weight $D(T)$ of the spin-1/2 $XXZ$ chain in the gapless regime. The thermodynamic Bethe ansatz (TBA) is applied in two different ways. In the first…