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Quasi-conserved quantities in the perturbed XXX spin chain

Malikis, Savvas ; Kurlov, Denis ; Gritsev, Vladimir

arXiv.org, 2020-12

Ithaca: Cornell University Library, arXiv.org

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  • Título:
    Quasi-conserved quantities in the perturbed XXX spin chain
  • Autor: Malikis, Savvas ; Kurlov, Denis ; Gritsev, Vladimir
  • Assuntos: Chains ; Integrals ; Perturbation ; Physics - Quantum Gases ; Physics - Statistical Mechanics
  • É parte de: arXiv.org, 2020-12
  • Descrição: We consider the isotropic spin-1/2 Heisenberg spin chain weakly perturbed by a local translationally- and SU(2)-invariant perturbation. Starting from the local integrals of motion of the unperturbed model, we modify them in order to obtain quasi-conserved integrals of motion (charges) for the perturbed model. Such quasi-conserved quantities are believed to be responsible for the existence of the prethermalization phase at intermediate timescales. We find that for a sufficiently local perturbation only the first few integrals of motion can be promoted to the quasi-conserved charges, whereas higher-order integrals of motion do not survive.
  • Editor: Ithaca: Cornell University Library, arXiv.org
  • Idioma: Inglês
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