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MA: Fachverband Magnetismus

MA 8: INNOMAG e.V. Prizes 2024 (Diplom-/Master and Ph.D. Thesis)

MA 8.1: Talk

Monday, March 18, 2024, 15:00–15:20, H 1058

Breakdown of Chiral Edge Modes in Topological Magnon Insulators — •Jonas Habel — Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München, Germany

Topological magnon insulators (TMI) are ordered magnets supporting chiral edge magnon excitations. These edge states are envisioned to serve as topologically protected information channels in low-loss magnonic devices. The standard description of TMI is based on linear spin-wave theory (LSWT), which approximates magnons as free noninteracting particles. However, magnon excitations of TMI are genuinely interacting even at zero temperature, calling into question descriptions based on LSWT alone. Here we perform a detailed nonlinear spin-wave analysis to investigate the stability of chiral edge magnons. For the first time, we provide direct theoretical evidence that the chiral edge states in topological magnon insulators decay. Our results highlight a challenge for the realization of novel spintronic devices based on topologically protected edge transport.

Keywords: Magnon-Magnon Interactions; Chiral Edge States; Linear Spin-Wave Theory; Magnon Decay