M. dos Santos Dias^1,2,3*, N. Biniskos^4*, F. J. dos Santos^5,6*, K. Schmalzl⁷, J. Persson⁸, F. Bourdarot⁹, N. Marzari^10,6, S. Blügel¹, S. Lounis^1,2

1 Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

2 Faculty of Physics, University of Duisburg-Essen and CENIDE, D-47053 Duisburg, Germany

3 Scientific Computing Department, STFC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom

4 Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1, D-85748 Garching, Germany

5 Theory and Simulation of Materials (THEOS), and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

6 Laboratory for Materials Simulations, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland

7 Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at ILL, 71 Avenue des Martyrs, F-38000 Grenoble, France

8 Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, D-52425 Jülich, Germany

9 Université Grenoble Alpes, CEA, IRIG, MEM, MDN, F-38000 Grenoble, France

10 Theory and Simulation of Materials (THEOS), and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

* Corresponding authors emails: m.dos.santos.dias@fz-juelich.de, n.biniskos@fz-juelich.de, flaviano.dossantos@epfl.ch

DOI10.24435/materialscloud:xq-5d [version v1]

Publication date: Jan 19, 2023

How to cite this record

M. dos Santos Dias, N. Biniskos, F. J. dos Santos, K. Schmalzl, J. Persson, F. Bourdarot, N. Marzari, S. Blügel, S. Lounis, Topological magnons driven by the Dzyaloshinskii-Moriya interaction in the centrosymmetric ferromagnet Mn₅Ge₃, Materials Cloud Archive 2023.12 (2023), doi: 10.24435/materialscloud:xq-5d.

Description

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. Hence, Mn₅Ge₃ is the first realization of 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.

Materials Cloud sections using this data

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bulkAl_Fig4b.aiida MD5md5:c83f9633fea9c5c0bd66d53b052bae38 Open this AiiDA archive on renkulab.io (https://renkulab.io/)	19.1 MiB	AiiDA export database used for Fig. 4b.
fermi_energy_3dd_M-P_Fig5a.ipynb MD5md5:ad36adc44c855f36d903a4f2afd5437e	155.3 KiB	Jupyter notebook used to generate Fig. 5a.
fermi_energy_3dd_Cold_Fig5b.ipynb MD5md5:160d9e5a6dabd54c7326bd142c5d9f86	320.3 KiB	Jupyter notebook used to generate Fig. 5b.
fermi_energy_3dd_24842struct_SecIIIB.json MD5md5:16f32a0b0871b43362aa759a9c973754	13.4 MiB	Parsed data (JSON format) generated with 'fermi_energy_3dd_M-P_Fig5a.ipynb'.
QE_subs.zip MD5md5:ee93af0eaa06367768bd4a2516ec21e4	35.0 KiB	Fortran module implementing the new protocol to determine the Fermi energy proposed by the main paper.
analysis_selected_structures_Fig7.ipynb MD5md5:a6675ae792ba1195cfbf1d8a198328cf	567.7 KiB	Jupyter notebook used for Fig. 7.
analysis_selected_structure_HT3_Fig7.json MD5md5:5c0ccbb4b2271bff6fa43d04a2e3f578	195.0 KiB	Parsed data (JSON format) generated by 'analysis_selected_structures_Fig7.ipynb'.
aiida_3dd_final_scf.aiida.zip MD5md5:d39e60cd472ede30680f3577bacedce0 Open this AiiDA archive on renkulab.io (https://renkulab.io/)	6.3 GiB	AiiDA database with relaxed structures their SCF calculations of the MC3D database.

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External references

Keywords

topological magnon spin waves inelastic neutron scattering Dzyaloshinskii-Moriya interaction MARVEL