Conductivity of quantum-spin chains: A Quantum Monte Carlo approach
arXiv:cond-mat/0204320 · doi:10.1103/PhysRevB.66.094403
Abstract
We discuss zero-frequency transport properties of various spin-1/2 chains. We show, that a careful analysis of Quantum Monte-Carlo (QMC) data on the imaginary axis allows to distinguish between intrinsic ballistic and diffusive transport. We determine the Drude weight, current-relaxation life-time and the mean-free path for integrable and a non-integrable quantum-spin chain. We discuss, in addition, some phenomenological relations between various transport-coefficients and thermal response functions.
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