Abstract
Abstract The optical absorption of a direct-gap semiconductor in the presence of dense impurities and a magnetic field of arbitrary strength is investigated using a two-band model and the formalism of the Kubo approach in the one-electron approximation. The treatment is based on the averages over the impurities of the two-particle propagator in the spirit of the Gaussian approximation. It is suggested that far above the absorption edge the magneto-absorption exhibits an oscillatory behaviour; below the absorption edge the optical absorption in the high field regime is considered, and near the absorption edge the slope of the absorption coefficient in a weak magnetic field is discussed.
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