Thermal transport in a two-dimensional $\mathbb{Z}_2$ spin liquid
Abstract
We study the dynamical thermal conductivity of the two-dimensional Kitaev spin-model on the honeycomb lattice. We find a strongly temperature dependent low-frequency spectral intensity as a direct consequence of fractionalization of spins into mobile Majorana matter and a static gauge field. The latter acts as an emergent thermally activated disorder, leading to the appearance of a pseudogap which partially closes in the thermodynamic limit, indicating a dissipative heat conductor. Our analysis is based on complementary calculations of the current correlation function, comprising exact diagonalization by means of a complete summation over all gauge sectors, as well as a phenomenological mean-field treatment of thermal gauge fluctuations, valid at intermediate and high temperatures. The results will also be contrasted against the conductivity discarding gauge fluctuations.
Cite
@article{arxiv.1707.03836,
title = {Thermal transport in a two-dimensional $\mathbb{Z}_2$ spin liquid},
author = {Alexandros Metavitsiadis and Angelo Pidatella and Wolfram Brenig},
journal= {arXiv preprint arXiv:1707.03836},
year = {2017}
}
Comments
11 pages, 9 figures