Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Quantum Magnets, Molecular Magnets and Skyrmions

TT 47.1: Talk

Wednesday, April 3, 2019, 15:00–15:15, H23

Electric field control of magnonic heat flow — •Benjamin Köhler and Wolfram Brenig — Institut für Theoretische Physik, Technische Universität Braunschweig, Germany

Insulating quantum magnets allow for genuine spin transport phenomena without carrier dynamics. Here we study the thermal conductivity of a two dimensional square lattice spin-1/2 Heisenberg antiferromagnet in the presence of a spatially confined, external electric field. The latter is used to alter the Dzyaloshinskii-Moriya interaction and hence the spin canting which controls the heat flow.

Using linear spin wave theory and a Kubo approach we evaluate the thermal conductivity taking into account current relaxation via intrinsic magnon-phonon scattering for finite fields and temperature. Semi-quantitative estimates for attainable variations of the heat conductivity in realistic materials will be presented as a function of the temperature, the external fields, and the size of the region the field is applied to.