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TT: Fachverband Tiefe Temperaturen

TT 19: Frustrated Magnets - Spin Liquids - Theory

TT 19.2: Vortrag

Montag, 12. März 2018, 15:15–15:30, H 3010

Thermal conductivity of a two-dimensional Z₂ spin liquid — •Angelo Pidatella¹, Alexandros Metavitsiadis², and Wolfram Brenig² — ¹Institute for Theoretical Physics, Technical University of Dresden — ²Institute for Theoretical Physics, Technical University of Braunschweig

We study the dynamical thermal conductivity of the two-dimensional Kitaev spin model on the honeycomb lattice. Mapping to Majorana particles, the transport properties are described in terms of itinerant matter fermions interacting with a localized Z₂ gauge field. Analyzing isotropic as well as anisotropic cases, in order to incorporate both, gapless and gapful phases of the Kitaev model, we discuss our findings for the thermodynamic properties and the transport coefficients, at finite temperature and frequency. 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 over a wide range of temperatures. We find the system to be a dissipative heat conductor in the isotropic case. Results for the anisotropic cases will also be discussed.