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Finite temperature Drude weight of the one dimensional spin 1/2 Heisenberg model}

X. Zotos
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Abstract

Using the Bethe ansatz method, the zero frequency contribution (Drude weight) to the spin current correlations is analyzed for the easy plane antiferromagnetic Heisenberg model. The Drude weight is a monotonically decreasing function of temperature for all 0<Delta< 1, it approaches the zero temperature value with a power law and it appears to vanish for all finite temperatures at the isotropic Delta=1 point.

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X. Zotos. 1998-11-02. Finite temperature Drude weight of the one dimensional spin 1/2 Heisenberg model}. https://doi.org/10.1103/physrevlett.82.1764

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