Abstract
We study quantum spin systems with quenched Gaussian disorder. We prove that the variance of all physical quantities in a certain class vanishes in the infinite volume limit. We study also replica symmetry breaking phenomena, where the variance of an overlap operator in the other class does not vanish in the replica symmetric Gibbs state. On the other hand, it vanishes in a spontaneous replica symmetry breaking Gibbs state defined by applying an infinitesimal replica symmetry breaking field. We prove also that the finite variance of the overlap operator in the replica symmetric Gibbs state implies the existence of a spontaneous replica symmetry breaking.
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Acknowledgements
It is pleasure to thank I. Affleck, T. Koma and R. M. Woloshyn for helpful discussions in early stage of this study. I would like to thank I. Affleck for kind hospitality at UBC. Also, I am grateful to R. M. Woloshyn for careful reading of the manuscript and for kind hospitality at TRIUMF.
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Itoi, C. Universal Nature of Replica Symmetry Breaking in Quantum Systems with Gaussian Disorder. J Stat Phys 167, 1262–1279 (2017). https://doi.org/10.1007/s10955-017-1778-y
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DOI: https://doi.org/10.1007/s10955-017-1778-y