Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2
TT 42.1: Vortrag
Mittwoch, 22. März 2017, 09:30–09:45, HSZ 304
Thermal transport in Kitaev spin systems — •Wolfram Brenig and Alexandros Metavitsiadis — Institute for Theoretical Physics, Technical University Braunschweig, Germany
We study the dynamical thermal conductivity of Kitaev spin models on two-leg ladders and honeycomb lattices. In contrast to the majority of conventional one-dimensional spin systems, we show the ladder to represent the rare case of a perfect heat insulator. This is a direct consequence of fractionalization of spins into mobile Majorana matter and static Z2 gauge fields. Our findings rest on complementary calculations of the current correlation function, comprising a mean-field treatment of thermal gauge fluctuations, a complete summation over all gauge sectors, as well as exact diagonalization of the original spin model. On the honeycomb lattice results will be presented from high temperature numerical diagonalization and from low temperature perturbation theory.