Anomalous nonequilibrium current fluctuations in the Heisenberg model
Strongly Correlated Electrons
2014-10-13 v2 Statistical Mechanics
Quantum Physics
Abstract
We study fluctuation properties of a one-dimensional anisotropic Heisenberg model out of equilibrium, focusing in particular on the gapped regime. Within the open-system setting we study large-deviation properties of the spin current. Numerically evaluating the first four current cumulants in a nonequilibrium stationary state at high energies, we find that the first two cumulants scale with the system size in a diffusive way, while the 3rd and the 4th cumulants do not. This means that the model is not an ordinary diffusive spin conductor.
Keywords
Cite
@article{arxiv.1405.5541,
title = {Anomalous nonequilibrium current fluctuations in the Heisenberg model},
author = {Marko Znidaric},
journal= {arXiv preprint arXiv:1405.5541},
year = {2014}
}
Comments
5 pages, 5 figs; v2.: some additional explanation and one new fig