Spin fluctuations after quantum quenches in the S=1 Haldane chain: Numerical validation of the semi-semiclassical theory

Miklós Antal Werner, Cǎtǎlin Paşcu Moca, Örs Legeza, Márton Kormos, Gergely Zaránd

Research output: Contribution to journalArticle

Abstract

We study quantum quenches in the S=1 Heisenberg spin chain and show that the dynamics can be described by the recently developed semi-semiclassical method based on particles propagating along classical trajectories but scattering quantum mechanically. We analyze the nonequilibrium time evolution of the distribution of the total spin in half of the system and compare the predictions of the semi-semiclassical theory with those of a non-Abelian time-evolving block decimation (TEBD) algorithm which exploits the SU(2) symmetry. We show that while the standard semiclassical approach using the universal low-energy scattering matrix cannot describe the dynamics, the hybrid semiclassical method based on the full scattering matrix gives excellent agreement with the first-principles TEBD simulation.

Original languageEnglish
Article number035401
JournalPhysical Review B
Volume100
Issue number3
DOIs
Publication statusPublished - Jul 1 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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