Hight Walker, A.
, Mai, T.
and Garrity, K.
(2025),
Topological Nodal Line and Weyl Magnons in the Non-Coplanar Antiferromagnet MnTe2, ACS Nature, Physics
(Accessed February 14, 2026)
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Topological Nodal Line and Weyl Magnons in the Non-Coplanar Antiferromagnet MnTe2
Published
Author(s)
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Abstract
Using a combination of band representation analysis, inelastic neutron scattering (INS), magneto-Raman spectroscopy measurements, and linear spin wave theory, we determine that the non-coplanar antiferromagnet MnTe2 hosts symmetry-protected topological nodal lines and Weyl points in its magnon spectrum. The non-coplanar nature of the antiferromagnetic ordering protects the topological magnon nodal lines that turn into Weyl magnons upon the application of the symmetry-breaking perturbation of a magnetic field. Zero-field INS measurements confirm the existence of the topological magnon nodal lines through the pseudo-spin winding of the scattering intensity in angular scans near the nodal lines, indicating the non-trivial topology of the magnon wavefunctions. This work establishes a clear magnonic analog to Weyl electrons, allowing further exploration of topological behavior in bosonic systems, and highlighting the rich interplay between magnetic order and band topology in non-coplanar antiferromagnets.Citation
ACS Nature, Physics
Pub Type
Journals
Keywords
Weyl, Magnon, Raman spectroscopy, Inelastic Neutron Scattering, Topological, linear spin wave theory
Citation
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Created December 20, 2025, Updated February 11, 2026