Abstract
An external electric field perpendicular to the plane of the layers of a semiconductor superlattice induces a localization of the eigenstates and a quantization of the energy spectrum. These effects which correspond to the Wannier-Stark quantization are not only remarkable from the point of view of basic physics but they are also potentially important for different applications in optoelectronics. Indeed the superlattice electro-absorption spectrum exhibits both a blue shift associated with the decoupling of the quantum wells and at very low field a red shift associated with the existence of transitions oblique in real space between states localized near adjacent quantum wells. Both effects have been observed at room temperature and have led to promising device performances.
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