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Disorder-induced preservation of nonthermal towers in spin-1 many-body systems

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  • Liu, Y.S.
  • Zhang, X.Z.

Abstract

Most interacting quantum systems obey the eigenstate thermalization hypothesis (ETH), leading to loss of memory of initial conditions. In contrast, quantum many-body scar states evade ETH and support long-lived coherent dynamics. In this work, we study scar states in a spin-1 chain with Heisenberg interactions, chiral three-spin couplings, and quenched transverse disorder. By tuning the disorder strength, we uncover a nonmonotonic crossover from integrability to chaos and eventually back to integrability. Within the weakly chaotic regime, an exact tower of states from the clean limit survives as scars, distinguished by their low entanglement entropy and anomalous dynamical revivals. Moreover, we demonstrate that the spectral position of these scar states can be shifted by adjusting interaction parameters. These results reveal a disorder-enabled mechanism for stabilizing nonthermal eigenstates and provide new insights into ergodicity breaking in disordered quantum systems.

Suggested Citation

  • Liu, Y.S. & Zhang, X.Z., 2025. "Disorder-induced preservation of nonthermal towers in spin-1 many-body systems," Chaos, Solitons & Fractals, Elsevier, vol. 201(P3).
    • Handle: RePEc:eee:chsofr:v:201:y:2025:i:p3:s0960077925013414
    DOI: 10.1016/j.chaos.2025.117328
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