Optical conductivity of the Kondo insulator YbB_12: Gap formation and low-energy excitations

H. Okamura, S. Kimura, H. Shinozaki +4

Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator YbB_12 in order to obtain its optical conductivity, σ(ω). Upon cooling below 70 K, a…