Incoherent transport induced by a single static impurity in a Heisenberg chain

Abstract

The effect of a single static impurity on the many-body states and on the spin and thermal transport in the one-dimensional anisotropic Heisenberg chain at finite temperatures is studied. Whereas the pure Heisenberg model reveals Poisson level statistics and dissipationless transport due to integrability, we show using the numerical approach that a single impurity induces Wigner-Dyson level statistics and at high enough temperature incoherent transport within the chain, whereby the relaxation time and d.c. conductivity scale linearly with length.

5 pages, 5 figures

References in corpus (2)

• Heat conduction in low-dimensional quantum magnets
• Finite temperature transport in disordered Heisenberg chains