Journal Articles New Journal of Physics Year : 2022

Topological thermal Hall effect and magnonic edge states in kagome ferromagnets with bond anisotropy

Abstract

Abstract The magnon band topology due to the Dzyaloshinskii–Moriya interaction (DMI) and its relevant topological thermal Hall effect has been extensively studied in kagome lattice magnets. In this theoretical investigation, we report a new mechanism for phase transitions between topological phases of magnons in kagome ferromagnets by tuning the anisotropic nearest-neighbor ferromagnetic interaction and DMI. Using the linear spin-wave theory, we calculate the Chern number and thermal Hall conductivity of magnons in low temperature regime. We show the magnon band structures and magnonic edge states in each topological phase. From the topological phase diagram, we find a sign reversal of the thermal Hall conductivity upon tuning the modulation factors. We explicitly demonstrate the correspondence of thermal Hall conductivity with the propagation direction of the magnonic edge states. Finally, we discuss candidate materials as experimental realizations of our theoretical model.
Fichier principal
Vignette du fichier
Topological thermal Hall effect and magnonic edge states in kagome ferromagnets with bond anisotropy.pdf (2) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-03830932 , version 1 (26-10-2022)

Identifiers

Cite

Fengjun Zhuo, Hang Li, Aurelien Manchon. Topological thermal Hall effect and magnonic edge states in kagome ferromagnets with bond anisotropy. New Journal of Physics, 2022, 24 (2), pp.023033. ⟨10.1088/1367-2630/ac51a8⟩. ⟨hal-03830932⟩
13 View
68 Download

Altmetric

Share

More