Abstract
We apply a semiclassical approach to express finite temperature dynamical correlation functions of gapped spin models analytically. We show that the approach of [Á. Rapp, G. Zaránd, Phys. Rev. B 74, 014433 (2006)] can also be used for the S = 1 antiferromagnetic Heisenberg chain, whose lineshape can be measured experimentally. We generalize our calculations to O(N) quantum spin models and the sine-Gordon model in one dimension, and show that in all these models, the finite temperature decay of certain correlation functions is characterized by the same universal semiclassical relaxation function.
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Rapp, Á., Zaránd, G. Universal diffusive decay of correlations in gapped one-dimensional systems. Eur. Phys. J. B 67, 7–13 (2009). https://doi.org/10.1140/epjb/e2008-00465-5
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DOI: https://doi.org/10.1140/epjb/e2008-00465-5