Measurement of the Terahertz magnon spectrum of single crystals of RFeO3

The topological classification of non-interacting magnons has been used to predict large classes of materials that host different kinds of bulk topological magnons and their corresponding surface states [1]. One such material is RFeO3 (R a rare earth metal), where it is predicted that a pair of Weyl magnons exist in the bulk Brillouin zone with corresponding magnon surface arcs. We report on our measurement of the reflectivity and transmissivity on RFeO3 single crystals to attempt to detect signatures of these surface states.

[1] M. Karaki, et al. Sci. Adv. 9, eade7731 (2023).