Related papers: Thermalization of exact quantum many-body scars in spin-1 XY chain under perturbations

Thermalization of exact quantum many-body scars in spin-1 XY chain under perturbations

URL: http://arxiv.org/abs/2511.17476v1
Date: Fri, 21 Nov 2025 18:25:44 GMT
Title: Thermalization of exact quantum many-body scars in spin-1 XY chain under perturbations
Authors: Himadri Halder,
Abstract summary: Quantum many-body scars are special eigenstates that violate the eigenstate thermalization hypothesis.<n>We study the stability of these scarred states against typical U(1) symmetry preserving perturbations in the XY chain.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum many-body scars are special eigenstates that violate the eigenstate thermalization hypothesis while residing at finite energy density along with thermalizing eigenstates. The spin-1 XY model is known to host a family of such exceptional states originating from long-lived quasiparticle excitations that exhibit anomalously low entanglement entropy and long-time periodic revivals, resulting in weak ergodicity breaking. We study the stability of these scarred states against typical U(1) symmetry preserving perturbations in the XY chain. While perturbation theory can describe the deformed scar states at small system sizes, finite-size scaling of the perturbation matrix elements indicates that the scars ultimately thermalize in larger chains. Nonetheless, we demonstrate that the long-range order associated with the scars decays under the perturbation, and we estimate the relaxation timescale of oscillatory dynamics in certain local observables to be of order $λ^{-2}$, where $λ$ is the perturbation strength.

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