Relaxation and entropy generation after quenching quantum spin chains
arXiv:2004.09550 · doi:10.21468/SciPostPhys.9.1.011
Abstract
This work considers entropy generation and relaxation in quantum quenches in the Ising and -state Potts spin chains. In the absence of explicit symmetry breaking we find universal ratios involving Rényi entropy growth rates and magnetisation relaxation for small quenches. We also demonstrate that the magnetisation relaxation rate provides an observable signature for the "dynamical Gibbs effect" which is a recently discovered characteristic non-monotonous behaviour of entropy growth linked to changes in the quasi-particle spectrum.
arXiv commentVersion 2: minor changes, abstract updated, `Submission to SciPost'; 28 pages, pdflatex, pdf figures. Version 3: clarifications and references added, typos corrected
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