Abstract
A graded-gap superlattice was investigated by electroreflectance (ER) at 80 K. With increasing electric-field strength the ER transitions of the individual wells exhibit first a redshift of 15 meV. At larger electric fields the typical blueshift of the Wannier-Stark localization is observed. This redshift of the transitions is explained by the formation of an electronic miniband at finite electric fields. This interpretation is supported by the calculation of the differential absorption as a function of the applied electric field. The calculations reproduce the main features of the experimental spectra.
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