2000 character limit reached
Spin transport in a one-dimensional anisotropic Heisenberg model (1103.4094v2)
Published 21 Mar 2011 in cond-mat.str-el and quant-ph
Abstract: We analytically and numerically study spin transport in a one-dimensional Heisenberg model in linear-response regime at infinite temperature. It is shown that as the anisotropy parameter Delta is varied spin transport changes from ballistic for Delta<1 to anomalous at the isotropic point Delta=1, to diffusive for finite Delta>1, ending up as a perfect isolator in the Ising limit of infinite Delta. Using perturbation theory for large Delta a quantitative prediction is made for the dependence of diffusion constant on Delta.
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