Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.5: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Thermal transport in the anisotropic two-dimensional Kitaev spin liquid — •Angelo Pidatella¹, Alexandros Metavitsiadis², and Wolfram Brenig² — ¹Institut für Theoretische Physik, Technische Universität Dresden — ²Institut für Theoretische Physik, Technische Universität Braunschweig

We investigate the longitudinal thermal transport of the two-dimensional Kitaev spin model on the honeycomb lattice, focusing on the role of anisotropic exchange to cover either gapless or gapped phases of the model. Combining exact diagonalization on small systems with an average gauge configuration approach for up to ∼ O(10⁴) spinful sites, we report our findings for the thermodynamic properties, the dynamical energy current auto-correlation function, as well as the static dc heat conductivity, over a wide range of temperatures and exchange anisotropies. We find that, despite a thermal gauge-disorder induced pseudogap in the correlation spectra on finite systems, and regardless of the anisotropy, both phases feature normal dissipative transport in the thermodynamic limit, with a low-temperature dependence crossing over from power law to exponentially activated behavior upon entering the gapped phase.