Exotic topological and transport properties of Weyl semimetals generated alot of excitement in the condensed matter community. Here we show that Weylsemimetals in a strong magnetic field are highly unusual optical materials. Thepropagation of electromagnetic waves is affected by an interplay betweenplasmonic response of chiral Weyl fermions and extreme anisotropy induced by amagnetic field. The resulting magneto-polaritons possess a number of peculiarproperties, such as hyperbolic dispersion, photonic stop bands,coupling-induced transparency, and broadband polarization conversion. Theseeffects can be used for optical spectroscopy of these materials includingdetection of the chiral anomaly, or for broadband terahertz/infraredapplications.
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