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Quantum relaxation and finite size effects in the XY chain in a transverse field after global quenches

We consider global quenches in the quantum XY chain in a transverse field and study the nonequilibrium relaxation of the magnetization and the correlation function as well as the entanglement entropy in finite systems. For quenches in the ordered phase, the exact results are well described by a semiclassical theory (SCT) in terms of ballistically moving quasiparticles. In the thermodynamic limit the SCT is exact for the entanglement entropy and its modified version following the method of Calabrese, Essler and Fagotti: arXiv:1204.3911 is exact for the magnetization and the correlation function, too. The stationary correlation function is shown to be described by a generalized Gibbs ensemble.

preprint2016arXivOpen access
Benjamin BlaßHeiko RiegerFerenc Iglói
cond-mat.stat-mechcond-mat.quant-gasquant-ph
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Benjamin BlaßHeiko RiegerFerenc Iglói

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