Thermal avalanches in a quasiperiodic XXZ model

Paolo Molignini; Antonio Štrkalj

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arXiv · 2607.21708

Thermal avalanches in a quasiperiodic XXZ model

Paolo Molignini·Antonio Štrkalj

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Abstract

We study bath-induced thermalization in the many-body localized XXZ spin chain subjected to a quasiperiodic magnetic field. We engineer a thermal inclusion by setting the field strength in one part of the chain below the localization threshold and analyze thermalization via the avalanche mechanism. To study the nature of such avalanches, we use two complementary observables, namely the two-point connected correlation function and the particle-number entropy. Surprisingly, the correlations alone show no signatures of avalanches. Instead, they display a logarithmic growth of the correlation length throughout the dynamics and predict localization lengths of the local integrals of motion that remain well below the avalanche threshold. In contrast, the particle number entropy shows clear signatures of the thermal avalanche, with the avalanche front progressively propagating deeper into the localized subsystem for sufficiently large baths. The discrepancy between the two observables shows that two-point correlations are unreliable in identifying thermal avalanches in quasiperiodic systems, as opposed to the random case. On one hand, qualitative results are consistent with the analytical predictions of the standard avalanche theory. On the other hand, significant quantitative deviations persist, which could be due to short-range resonances generated by the quasiperiodic potential. Our results suggest that the standard avalanche framework requires revision to account for the short-range correlations of quasiperiodic potentials.

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cond-mat.dis-nn cond-mat.quant-gas cond-mat.stat-mech cond-mat.str-el

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Paolo Molignini, Antonio Štrkalj. 2026-07-23. Thermal avalanches in a quasiperiodic XXZ model. https://arxiv.org/abs/2607.21708

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