Long range correlations in the non-equilibrium quantum relaxation of a spin chain
arXiv:cond-mat/0003193 · doi:10.1103/PhysRevLett.85.3233
Abstract
We consider the non-stationary quantum relaxation of the Ising spin chain in a transverse field of strength h. Starting from a homogeneously magnetized initial state the system approaches a stationary state by a process possessing quasi long range correlations in time and space, independent of the value of $h$. In particular the system exhibits aging (or lack of time translational invariance on intermediate time scales) although no indications of coarsening are present.
4 pages RevTeX, 2 eps-figures included