Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Magnonics 2
MA 28.12: Vortrag
Donnerstag, 8. September 2022, 12:15–12:30, H43
Topological magnons driven by the Dzyaloshinskii-Moriya interaction in the centrosymmetric ferromagnet Mn5Ge3 — •Manuel dos Santos Dias1,2, Nikolaos Biniskos3, Flaviano José dos Santos4, Karin Schmalzl5, Jörg Persson6, Nicola Marzari4, Stefan Blügel2, Thomas Brückel6, and Samir Lounis1,2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, FZ Jülich & JARA, Jülich, DE — 2Faculty of Physics, University of Duisburg-Essen and CENIDE, Duisburg, DE — 3FZ Jülich, Jülich Centre for Neutron Science at MLZ, Garching, DE — 4Theory and Simulation of Materials and National Centre for Computational Design and Discovery of Novel Materials, EPFL, Lausanne, CH — 5FZ Jülich, Jülich Centre for Neutron Science at ILL, Grenoble, FR — 6FZ Jülich, Jülich Centre for Neutron Science and Peter Grünberg Institut, JARA-FIT, Jülich, DE
The Berry phase of electrons and magnons can lead to various unique transport effects and protected edge states of topological nature. Here, we show theoretically and via inelastic neutron scattering experiments that bulk ferromagnetic Mn5Ge3 hosts 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 spectra. This gap is predicted and experimentally verified to close by rotating the magnetization from being parallel to being perpendicular to the c-axis. The tunability of Mn5Ge3 by chemical doping or by thin film nanostructuring makes it an exciting new platform to explore and design topological magnons.