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| Home > Publications database > Topological magnons driven by the Dzyaloshinskii-Moriya interactionin the centrosymmetric ferromagnet Mn5Ge3 |
| Home > Publications database > Topological magnons driven by the Dzyaloshinskii-Moriya interactionin the centrosymmetric ferromagnet Mn5Ge3 |
| Poster (Invited) | FZJ-2025-04246 |
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2025
Abstract: The phase of the quantum-mechanical wave function can encode a topological structure with widerangingphysical consequences, such as anomalous transport effects and the existence of edge statesrobust against perturbations. While this has been exhaustively demonstrated for electrons, propertiesassociated with the elementary quasiparticles in magnetic materials are still underexplored.In our joint project, we have shown theoretically and via inelastic neutron scattering experimentsthat the bulk ferromagnet Mn5Ge3 hosts gapped topological Dirac magnons [1]. Although inversionsymmetry prohibits a net Dzyaloshinskii-Moriya interaction in the unit cell, it is locally allowed andis responsible for the gap opening in the magnon spectrum. This gap is predicted and experimentallyverified to close by rotating the magnetization away from the c-axis with an applied magneticfield. Hence, Mn5Ge3 realizes a gapped Dirac magnon material in three dimensions. Its tunabilityby chemical doping or by thin film nanostructuring defines an exciting new platform to explore anddesign topological magnons. More generally, our experimental route to verify and control the topologicalcharacter of the magnons is applicable to bulk centrosymmetric hexagonal materials, whichcalls for systematic investigation.[1] M. dos Santos Dias et al., Nat. Commun. 14, 7321 (2023).
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