Far-infrared magneto-optical experiments have been performed on a p-type HgTe/CdTe superlattice with a small effective band gap. The angular dependence of the hole-cyclotron-resonance spectra reveals that the effective mass is 2 orders of magnitude heavier in the growth direction than transverse to it. These results provide evidence for a large valence-band offset. In addition, a tentative identification of hole spin resonance has been made. Evidence is presented which shows that the superlattice band structure can be substantially modified by the application of modest magnetic fields.
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Wagner et al. (1988) studied this question.
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