Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Terahertz Spintronics
MA 12.3: Talk
Monday, March 9, 2026, 15:30–15:45, POT/0351
Spin Inertia as a Source of Topological Magnons — •Subhadip Ghosh1, Mikhail Cherkasskii2, Ritwik Mondal1, Alexander Mook3, and Levente Rozsa4 — 1IIT (ISM) Dhanbad, India. — 2RWTH Aachen University, Germany. — 3University of Munster, Germany — 4BME, Budapest, Hungary
Ferromagnets exhibit not only the familiar precessional magnon bands, but also high-frequency nutational modes originating from spin inertia [1]. In this work, we show that the hybridization between these nutational and precessional branches opens a magnonic gap whose topology can become nontrivial. In a honeycomb ferromagnet, this topological phase is caused by the pseudodipolar coupling, which not only gaps out the well-known precessional Dirac cones [2,3] but also causes precessional and nutational modes to anticross. By computing the Chern numbers of the full magnon spectrum, we demonstrate that the nutational-precessional gap can host chiral, topologically protected edge states. We highlight the role of spin inertia as a source of topological magnonic phenomena.
[1] R. Mondal et al., Phys. Rev. B 106, 134422 (2022).
[2] A. Mook et al., Phys. Rev. B. 90, 024412 (2014).
[3] X. S. Wang et al., Phys. Rev. Appl. 9, 024029 (2018).
Keywords: Inertial magnons; Topological magnons; Ultrafast terahertz magnonics; Edge mods; Berry curvature