Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.38: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

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

We study the finite temperature thermal transport properties of the Kitaev-Heisenberg two-leg spin ladder, within the framework of linear response theory. For simultaneously non-vanishing Kitaev and Heisenberg exchange, we present results from numerical techniques, namely Exact Diagonalization and the Quantum Typicality, to explore the parameter space. In the absence of Heisenberg interactions, the model is exactly solvable, and we support our numerical findings with analytical results. In addition, the large number of conservation laws allows a detailed analysis of the transport properties in different Hilbert space subsectors, classified by different Z₂ gauge flux configurations. Finally we will focus on the breaking of integrability with the onset of a Heisenberg coupling on the ladder, starting from purely Kitaev exchange.