1305.0468 (Maurizio Fagotti et al.)

Stationary behaviour of observables after a quantum quench in the
spin-1/2 Heisenberg XXZ chain    [PDF]

Maurizio Fagotti, Fabian H. L. Essler

We consider a quantum quench in the spin-1/2 Heisenberg XXZ chain. At late times after the quench it is believed that the expectation values of local operators approach time-independent values, that are described by a generalized Gibbs ensemble. Employing a quantum transfer matrix approach we show how to determine short-range correlation functions in such generalized Gibbs ensembles for a class of initial states.

View original: http://arxiv.org/abs/1305.0468