Interband Magneto-Absorption and Faraday Rotation in InSb

Direct interband magneto-optical transitions have been observed in pure n-type InSb at liquid-helium temperature using magnetic fields up to 96.5 kG. The theory of the magnetic levels in the valence and conduction bands at the zone center is carried out using a modification of the method of Luttinger and Kohn. The interaction between conduction and valence bands has been treated exactly, and the effect of higher bands to order k². Selection rules have been evaluated for both allowed (Δn=0, -2) and warping-induced (Δn=2, ±4, -6) direct valence-to-conduction-band transitions. Comparison of theoretical with experimental spectra (using circular and plane-polarized light in the Faraday and Voigt configurations, respectively) has shown good agreement for the magnetic field in the [110] and [100] crystal directions. The following band parameters are obtained: conduction-band effective mass mc=0.0145m₀: light-hole effective mass ml.h.=0.0160m₀; heavy-hole effective masses mh.h.[100]=0.32m₀, mh.h.[110]=0.42m₀, mh.h.[111]=0.44m₀.