Evidence from Cyclotron-Resonance Measurements for Spin-Degeneracy Splitting of the Valence Band of InSb Neark→=0

Abstract

Cyclotron-resonance measurements of holes in high-purity $p$-type indium antimonide have been extended to liquid-helium temperatures, using light to excite free carriers. The resonance spectrum differs from that observed at higher temperatures, and is interpreted in terms of a splitting of the heavy-hole valence band in the vicinity of $\overrightarrow{\mathrm{k}}=0\mathrm{}$.