Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Computational Magnetism

MA 45.2: Vortrag

Freitag, 21. März 2025, 09:45–10:00, H18

Intrinsic Spin Nernst Effect and Chiral Edge Modes in vdW Ferromagnetic Insulators: Dzyaloshinskii-Moriya vs. Kitaev Interactions — •Verena Brehm and Alireza Qaiumzadeh — NTNU Trondheim, Norway

The thermomagnetic Nernst effect and chiral edge states are key signatures of nontrivial topology and emerging Berry curvature in magnonic systems. Implementing atomistic spin simulations, we theoretically demonstrate the emergence of chiral magnon edge states at the boundaries of a ferromagnetic hexagonal lattice in the presence of Dzyaloshinskii-Moriya and Kitaev interactions, which are robust against nonlinear magnon interactions. In our simulations, we consider the spin parameters of CrI3 as a prototype of van der Waals magnetic layers. We show that the spin accumulation is reduced in the presence of Kitaev spin interactions compared to systems governed by Dzyaloshinskii-Moriya interactions. This reduction stems from the breaking of the U(1) symmetry, which leads to a shorter spin coherence length imposed by the Kitaev interaction. We propose that measuring the angular dependence of the Nernst signal in a magnetic field provides an effective indirect method for identifying the microscopic origin of topological magnons. Our findings hold promising potential for advancing next-generation energy-harvesting Nernst materials and facilitating the integration of topological magnetic materials with spintronic-based quantum technologies.

Keywords: Magnon topology; Atomistic spin simulations; Van der Waals magnets