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MA: Fachverband Magnetismus

MA 40: Focus Session: Chiral phonons and crystals coupled to magnetic order II

MA 40.6: Hauptvortrag

Donnerstag, 12. März 2026, 11:15–11:45, HSZ/0002

Thermal Hall Effects of Magnons and Phonons — •Alexander Mook — Universität Münster

Thermal Hall transport in insulating magnets provides a powerful probe of topology, interactions, and spin-lattice coupling in charge-neutral quantum matter. I will discuss the magnon thermal Hall effect arising from Berry curvature in altermagnets, and show how symmetry and band geometry control transverse heat currents carried by spin waves [1]. Going beyond single-particle pictures, I highlight recent theoretical results demonstrating that magnon-magnon interactions can generate intrinsic thermal Hall responses even in topologically trivial magnon bands [2]. I then turn to magnetoelastic systems, where magnon-phonon coupling produces hybrid excitations whose combined Berry curvature and scattering processes can strongly enhance or even invert the thermal Hall signal [3,4]. Together, these results establish thermal Hall transport as a genuinely many-body phenomenon governed by topology, interactions, and spin-lattice hybridisation.

[1] Hoyer et al., PRB 111 (2), L020412 (2025) [2] Chatzichrysafis, Mook, PRB 111 (13), 134405 (2025) [3] Li et al., PRB 108 (14), L140402 (2023) [4] Nawwar et al., Reports on Progress in Physics 88 (8), 080503 (2025)

Keywords: Magnon; Phonon; Thermal Hall Effect