Quasi-particle spectrum and entanglement generation after a quench in the quantum Potts spin chain

O. Pomponio, L. Pristyák, G. Takács

Research output: Contribution to journalArticle


Recently, a non-trivial relation between the quasi-particle spectrum and entanglement entropy production was discovered in non-integrable quenches in the paramagnetic Ising quantum spin chain. Here we study the dynamics of analogous quenches in the quantum Potts spin chain. Tuning the parameters of the system, we observe a sudden increase in the entanglement production rate, which is shown to be related to the appearance of new quasiparticle excitations in the post-quench spectrum. Our results demonstrate the generality of the effect and support its interpretation as the non-equilibrium version of the well-known Gibbs paradox related to mixing entropy which appears in systems with a non-trivial quasi-particle spectrum.

Original languageEnglish
Article number013104
JournalJournal of Statistical Mechanics: Theory and Experiment
Issue number1
Publication statusPublished - Jan 30 2019


  • breaking integrability
  • entanglement in extended quantum systems
  • ladders and planes
  • quantum quenches
  • spin chains

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Statistics, Probability and Uncertainty

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