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@INPROCEEDINGS{dosSantos:1047350,
      author       = {dos Santos, F. J. and Bourdarot, F. and Perßon, J. and
                      Schmalzl, K. and dos Santos Dias, M. and Marzari, N. and
                      Biniskos, N. and Lounis, S. and Blügel, S. and Brückel,
                      T.},
      title        = {{T}opological magnons driven by the
                      {D}zyaloshinskii-{M}oriya interactionin the centrosymmetric
                      ferromagnet {M}n5{G}e3},
      reportid     = {FZJ-2025-04246},
      year         = {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).},
      month         = {Oct},
      date          = {2025-10-07},
      organization  = {JCNS Workshop 2025, Trends and
                       Perspectives in Neutron Scattering.
                       Quantum Materials: Theory and
                       Experiments, Evangelische Akademie
                       Tutzing (Germany), 7 Oct 2025 - 9 Oct
                       2025},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / PGI-1 / JCNS-ILL},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1047350},
}