We analyze the recent numerical computations made by Fabricius, L{ \" o}w and Stolze to show that the long time behavior of the zz correlation function of the spin 1/2 XXZ chain at $T=\infty$ is very well fit by the formula $t^{ -d}[A+Be^{ -\gamma (t-t_0)}\cos \Omega(t-t_0)]$ where $d$ is substantially greater than 1/2. This confirms the conclusion that there is no spin diffusion in this model.
Categories: cond-mat hep-th