THE ELECTRONIC-STRUCTURE OF THE PERTURBED SUPERLATTICE - THE CASE OF BRAGG-CONFINED DOUBLE-QUANTUM-WELL RESONANT STRUCTURES

The electronic structure of a perturbed superlattice of the Bragg-conf ined resonant structure type is discussed within the effective mass ap proximation. Expressions for bound-state energies and wavefunctions in these structures are derived in general form, valid for any symmetric form of the potential and effective mass modulation. The special case of rectangular superlattices with a perturbation layer is considered in more detail. The influence of the structure parameters on propertie s of Bragg-confined states is analysed, and positions of bound states lying in minigaps of the structure with the resonant double-well pertu bation layer are determined. The possibilities of finding optimal stru cture parameters in respect to the maximal localization of the bound-s tate wavefunctions, in a broad range of above-the-barrier energies, ar e also discussed. (C) 1998 Academic Press Limited.