Abstract
There has been a large amount of experimental and theoretical work on optical excitation between quantized levels of superlattices or quantum wells. Most results deal with level spectroscopy, but fewer are concerned with the transport of electrons perpendicular to the layers in the absence of an electric field. We report photoemission measurements in a GaAs/GaAIAs superlattice covered by a GaAs surface activated to negative electron affinity by cesium and oxygen coadsorption.
© 1986 Optical Society of America
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