Journal Article

FZJ-2023-04460

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Topological magnons driven by the Dzyaloshinskii-Moriya interaction in the centrosymmetric ferromagnet Mn5Ge3

dos Santos Dias, M. (Corresponding author)FZJ* ; Biniskos, N. (Corresponding author)FZJ* ; dos Santos, F. J. (Corresponding author) ; Schmalzl, K.FZJ* ; Perßon, J.FZJ* ; Bourdarot, F. ; Marzari, N. ; Blügel, S.FZJ* ; Brückel, T.FZJ* ; Lounis, S.FZJ*

2023
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-023-43042-3  doi:10.34734/FZJ-2023-04460

Abstract: The phase of the quantum-mechanical wave function can encode a topological structure with wide-ranging physical consequences, such as anomalous transport effects and the existence of edge states robust against perturbations. While this has been exhaustively demonstrated for electrons, properties associated with the elementary quasiparticles in magnetic materials are still underexplored. Here, we show theoretically and via inelastic neutron scattering experiments that the bulk ferromagnet Mn5Ge3 hosts gapped topological Dirac magnons. Although inversion symmetry prohibits a net Dzyaloshinskii-Moriya interaction in the unit cell, it is locally allowed and is responsible for the gap opening in the magnon spectrum. This gap is predicted and experimentally verified to close by rotating the magnetization away from the c-axis with an applied magnetic field. Hence, Mn5Ge3 realizes a gapped Dirac magnon material in three dimensions. Its tunability by chemical doping or by thin film nanostructuring defines an exciting new platform to explore and design topological magnons. More generally, our experimental route to verify and control the topological character of the magnons is applicable to bulk centrosymmetric hexagonal materials, which calls for systematic investigation.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. JCNS-ILL (JCNS-ILL)
3. Streumethoden (JCNS-2)
4. JARA-FIT (JARA-FIT)
5. Streumethoden (PGI-4)
6. Quanten-Theorie der Materialien (IAS-1)
7. Quanten-Theorie der Materialien (PGI-1)
8. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
3. 5211 - Topological Matter (POF4-521) (POF4-521)
4. DFG project 360506545 - SPP 2137: Skyrmionics: Topologische Spin-Phänomene im Realraum für Anwendungen (360506545) (360506545)

Experiment(s):

1. ILL-IN12: Cold neutron 3-axis spectrometer

Appears in the scientific report 2023

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