Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Spin-Dependent Phenomena in 2D

MA 3.4: Vortrag

Montag, 5. September 2022, 10:15–10:30, H43

topological magnons and thermal hall conductivity in 2D magnets — •Hamid Nouri and Hongbin Zhang — Technical University of Darmstadt, 64287 Darmstadt, Germany

Two-dimensional (2D) materials provide a fascinating playground for emergent phenomena driven by enhanced thermal and quantum fluctuations, in particular the nontrivial topological phases with the associated dissipationless transport properties. For 2D magnetic insulators, magnons can also host Dirac and Weyl points with nonzero Berry curvature, leading to finite thermal Hall conductivities. In this work, based on the linear response spin-wave theory, we investigated a Hamiltonian formulated on 2D lattices comprising the Heisenberg exchange, Dzyaloshinskii-Moriya interaction (DMI) interactions, single-ion anisotropy, external magnetic fields, and found that the gapped magnon bands exhibit nonzero Chern numbers of *1 due to finite DMI which acts like effective spin-orbit coupling. The thermal Hall conductivity is evaluated based on the Boltzmann transport theory, suggesting a novel approach to designing 2D thermal management materials. The realization of such Hamiltonians in experimentally available 2D materials will be discussed as well.