THE ELECTRONIC TRANSMITTANCE AND DENSITY-OF-STATES IN TRIANGULAR QUANTUM-WELL AND BARRIER STRUCTURES

A detailed study of the electronic properties of analogue quantum well s and barriers and their supposedly 'equivalent' digital structures is presented. The calculations, based on an sp(3)s tight-binding model, show that there are significant differences. The digital structures h ave some diffractive character and this produces a tendency towards so me quantum mechanical interference effects which determine some distin ctive features in the transmittance and spatial localization at some e nergies or in some energy ranges. Selected cases are studied in detail showing the differences between analogue and digital structures.