Abstract
The interface states of Ge-GaAs(111) and ( 111 ) heterojunctions are calculated by applying extended Hückel theory to a superlattice with alternating Ge and GaAs atomic layers. The band-edge discontinuity, interface bands, and local densities of states are presented. It is found that no interface states are revealed in the fundamental gaps of Ge and GaAs and that there is an appreciable difference in electronic structure between both kinds of interface.
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