Interband Magnetoabsorption in InAs and InSb

Direct interband magneto-optical transitions have been observed in bulk and epitaxial films of InAs with magnetic fields up to 100 kOe. The results are interpreted using a modification of the method of Luttinger and Kohn which includes the effects of nonparabolic conduction and light-hole bands, and warping of the conduction and valence bands. The following band parameters at k=0 are obtained for $T\sim 20°$K: conduction-band effective mass $m_c=0.0240\mathrm{}{m}_0$; light-hole effective mass $m_{\mathrm{lh}}=0.026\mathrm{}{m}_0$; and conduction-band $g$ factor $g_c=-15\mathrm{}$. Further experimental results (obtained from magnetoabsorption data) are given for the energy dependence of the conduction-band $g$ factors in InSb and InAs. These are compared with the results computed theoretically.