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- W4220806498 abstract "We investigate the magnetic excitations of elemental gadolinium (Gd) using inelastic neutron scattering, showing that Gd is a Dirac magnon material with nodal lines at K and nodal planes at half integer ℓ. We find an anisotropic intensity winding around the K-point Dirac magnon cone, which is interpreted to indicate Berry phase physics. Using linear spin wave theory calculations, we show the nodal lines have nontrivial Berry phases, and topological surface modes. We also discuss the origin of the nodal plane in terms of a screw-axis symmetry, and introduce a topological invariant characterizing its presence and effect on the scattering intensity. Together, these results indicate a highly nontrivial topology, which is generic to hexagonal close packed ferromagnets. We discuss potential implications for other such systems." @default.
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- W4220806498 date "2022-03-02" @default.
- W4220806498 modified "2023-09-27" @default.
- W4220806498 title "Dirac Magnons, Nodal Lines, and Nodal Plane in Elemental Gadolinium" @default.
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- W4220806498 doi "https://doi.org/10.1103/physrevlett.128.097201" @default.
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