Thermal transport properties of disordered spin-1/2 systems

Details Thermal transport properties of disordered spin-1/2 systems Thermal transport properties of disordered spin-1/2 systems

2006-03-03

arxiv.org/abs/cond-mat/0603081v1

Physica B 378-380, 299-330 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure. To be published in the Proceedings of SCES '05, Vienna, in Physica B

Scientific paper

10.1016/j.physb.2006.01.548

This work studies heat transport of bond-disordered spin-1/2 chains. As an example, the XX case is analyzed, which corresponds to a model of noninteracting spinless fermions. Within the fermion representation, the single-particle eigenenergies are determined numerically, which allow one to compute transport coefficients. Since the ballistic transport properties of a clean chain are destroyed by disorder, the focus is on the frequency dependence of the thermal conductivity and on a qualitative comparison with the spin conductivity, both at finite temperatures.

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