Abstract
Transitions between the Landau levels of the N = 1 electron and heavy hole sub-bands have been observed in the inter-band optical absorption of a modulation doped Ga 0.47In 0.53As-Al 0.48In 0.52As multi-quantum well in magnetic fields up to 16T. Results are compared with the results of conduction band cyclotron resonance on the same sample to obtain measurements of both the electron and the heavy hole effective mass, and the results are compared with known values for bulk GaInAs. It is shown that the electron states at high energies are in good agreement with the predictions of three-band k . p theory. This is in contrast to the cyclotron resonance results, for which a substantial polaron correction is required.
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