Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Low-Dimensional Systems: 1D - Theory

TT 24.9: Vortrag

Dienstag, 21. März 2017, 11:45–12:00, HSZ 204

Thermal transport in Kitaev--Heisenberg ladders — •Alexandros Metavitsiadis and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, Braunschweig, Germany

We study the finite temperature thermal transport properties of a Kitaev--Heisenberg two leg ladder, as a minimum quasi one--dimensional representative of the corresponding two--dimensional model on a Honeycomb lattice. In the absence of Heisenberg interactions, we find that the pure Kitaev ladder is an ideal heat insulator at all temperatures. This is a direct consequence of the fractionalization of spin degrees of freedom which acts as a thermally activated disorder leading to localization. On the other hand, Heisenberg interactions restore DC conductivity, driving the system into a conducting state where transport is mediated by triplon excitations. We primarily rely on numerical techniques, namely exact diagonalization and the quantum typicality.