Semiconductor Superfine Structures by Computer-Controlled Molecular Beam Epitaxy.

摘要

This study was initiated to investigate experimentally a fundamental quantum mechanical effect-the resonant transmission of electron waves through potential barriers in semiconductors. The familiar Kronig-Penney model of a one-dimensional crystal consists of a series of equally spaced barriers, of which the electronic structure exhibits allowed bands of perfect transmission separated by forbidden bands of attenuation. The simplest case for such resonant phenomena is perhaps double-barrier tunneling-one of the most elementary problems in quantum mechanics-where, if the energy of incident electrons coincides with the resonant energies, the electrons tunnel through both barriers without attenuation. This paper first explains our theoretical analysis which motivated this investigation, then describes the preparation technique and finally summarizes the recent results on structural analyses and electron transport properties, including those from photocurrent measurements, for multilayer structures. (Author)