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Topological magnon insulators support chiral edge excitations, whose lack ofelectric charge makes them notoriously difficult to detect experimentally. Weshow that relativistic magnetoelectric coupling universally renders chiral edgemagnons electrically active, thereby facilitating electrical probes of magnontopology. Considering a two-dimensional out-of-plane magnetized topologicalmagnon insulator, we predict a fluctuation-activated electric polarizationperpendicular to the sample edges. Furthermore, the chiral topologicalelectromagnons give rise to a unique in-gap signal in electrical absorptionexperiments. These results suggest THz spectroscopy as a promising probe fortopological magnons.

Electrical Activity of Topological Chiral Edge Magnons