A symmetry-allowed electric-dipole term creates magnon pairs, so THz pumping can selectively amplify and detect topological magnon edge states.
Neumann, J¨ urgen Henk, Ingrid Mertig, and Alexander Mook
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Signatures of Topological Magnon Edge States in THz Spectroscopy and Cavity Response
A symmetry-allowed electric-dipole term creates magnon pairs, so THz pumping can selectively amplify and detect topological magnon edge states.