Magneto‐optical determination of light‐heavy hole splittings in As‐rich, InAsSb alloys and superlattices

Interband magnetophotoconductive spectroscopy was used to determine the reduced masses of several optical transitions in an InAs1−xSbx/In1−xGaxAs strained‐layer superlattice and a superlattice constituent, InAs1−xSbx alloy (x≊0.1). In both the alloy and the superlattice, light and heavy hole transitions were identified. From the light‐heavy hole splitting in the superlattice, we estimate the valence band offset and find type I behavior. Effective masses and band gap energy are measured for the CuPt ordered alloy.