Optical and dielectric properties of LuSb and LuBi semimetallic compounds

In the energy range of 0.077–5.64 eV, the refractive indices and absorption coefficients of LuSb and LuBi semimetallic compounds were measured using an ellipsometric method. The spectra of dielectric constant, optical conductivity, reflectivity, and the function of characteristic electron energy losses were obtained. The features of interband light absorption in both materials are interpreted on the basis of a comparative analysis of experimental and theoretical optical conductivity spectra. It has been established that the optical characteristics of compounds in the infrared region of the spectrum exhibit abnormal behavior due to their semi-metallic nature.