Abstract
We have experimentally and theoretically studied electroabsorption properties of a novel superlattice having well width asymmetry and barrier sequence bi periodicity. Electric field-induced energy variations of the optical transitions observed by room temperature photocurrent spectroscopy show that several Stark-ladder branches in the fan diagram converge to different points. These “staggered” Stark ladders undergo large level anticrossings and result in a distinct blueshift of the optical absorption edge. Theoretical analyses on the variations of eigenenergies and the localization of wave functions of the Stark-ladder states clearly explain the experimental data. An advantage of the novel structure to optoelectronic device application is also shown in comparison with a conventional mono-periodic superlattice.
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