Dual Optical Hyperbolicity of PdCoO${}_2$ and PdCrO${}_2$ Delafossite Single Crystals

Salvatore Macis, Annalisa DArco, Eugenio Del Re +12

Hyperbolic materials exhibit a very peculiar optical anisotropy with simultaneously different signs of the dielectric tensor components. This anisotropy allows the propagation of e…