Abstract
This paper presents a model calculation of the uncorrelated bulk and surface states of a superlattice, simulated by the Kronig-Penney model, with a periodic array of defects. Inside each quantum well, there is a defect barrier. Explicit results are obtained for the bulk dispersion relation for the minibands for two types of defects: (a) rectangular and (b) triangular. We examine the bulk band structure as a function of the width of the defect and its position within the quantum well. We also calculate the bulk band structure when two defects are inserted inside the well. The virtual surface states for the doped superlattice when an external electric field is applied at the surface are also obtained.
- Received 2 January 1990
DOI:https://doi.org/10.1103/PhysRevB.41.10124
©1990 American Physical Society