title: Long-range correlations in the nonequilibrium quantum relaxation of a spin chain.
abstract: We consider the nonstationary 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.
authors.affiliation: Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O. Box 49, Hungary.
authors.forename: F
authors.initials: F
authors.lastname: Iglói
authors.forename: H
authors.initials: H
authors.lastname: Rieger