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The density of states is calculated for superlattices in the presence of an electric field, using the concept of a generalized transmission probability. Various Ga_1-x{Al}ₓAs-based quantum-well structures with up to 200 periods are examined for electric fields ranging from 4×{10}²V/cm to 1×{10}⁶$ V/cm. Different field effects are observed in the below- and above-barrier regions of the density-of-states spectra. In the below-barrier region the spectra embody the occurrence of Wannier-Stark localization. The above-barrier region is dominated by two kinds of structures, one similar to Franz-Keldysh oscillations, and another resembling a Wannier-Stark-ladder behavior.
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Ritze et al. (1993) studied this question.
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