## Relaxation and entropy generation after quenching quantum spin chains

Máté Lencses, Octavio Pomponio, Gabor Takacs

SciPost Phys. 9, 011 (2020) · published 22 July 2020

### Abstract

This work considers entropy generation and relaxation in quantum quenches in the Ising and $3$-state Potts spin chains. In the absence of explicit symmetry breaking we find universal ratios involving R\'enyi 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.

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