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Abstract
Transmission and photoluminescence measurements in GaAs/Al0.3As0.7As superlattices in which the layer widths vary randomly, illustrate the effects of one-dimensional non-periodic potentials on electronic energy states. The fundamental interband transition energy in the non-periodic structures is lower than that in the periodic case. A relation between this shift and the wavefunction localization length is derived. The PL emission from the non-periodic samples is ten to twenty times stronger than from the periodic samples.
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