IMPURITY-RELATED ENERGIES OF SEMICONDUCTING SUPERLATTICES - PERIODICITY AND MAGNETIC-FIELD EFFECTS

A detailed study of the ground-state binding energies of donor states on semiconducting superlattices composed by different layer arrangemen ts is presented. The effects of magnetic fields, applied parallel to t he superlattice growth direction on the binding energies and on energi es associated to transition from electron-conduction subband and accep tor states, are analyzed and compared with available experimental data . The energies are obtained via variational calculations and adopting an effective one-dimensional potential describing both the impurity Co ulomb and magnetic interactions, A discussion of the effects of the la yers arrangement (periodic, quasiperiodic, or random) on the impurity binding energy is presented.