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A Lieb-Robinson bound for quantum spin chains with strong on-site impurities

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arxiv 2104.00968 v1 pith:ZE3WARD3 submitted 2021-04-02 math-ph math.MP

classification math-phmath.MP
keywords impuritiesspinboundschainheisenberglieb-robinsonon-sitequantum
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We consider a quantum spin chain with nearest neighbor interactions and sparsely distributed on-site impurities. We prove commutator bounds for its Heisenberg dynamics which incorporate the coupling strengths of the impurities. The impurities are assumed to satisfy a minimum spacing, and each impurity has a non-degenerate spectrum. Our results are proven in a broadly applicable setting, both in finite volume and in thermodynamic limit. We apply our results to improve Lieb-Robinson bounds for the Heisenberg spin chain with a random, sparse transverse field drawn from a heavy-tailed distribution.

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  1. Logarithmic lightcones in the multiparticle Anderson model with sparse interactions

    math-ph 2025-09 conditional novelty 7.0 of 10

    A single strong ZZ interaction in the 1D XY/Anderson model yields Lieb-Robinson bounds with a logarithmic lightcone and amplitude suppressed as 1/Δ.

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