Abstract
Publisher Summary This chapter discusses only one facet of the field of modulation spectroscopy, electro-absorption. Electro-absorption has turned out to be useful for the study of the lowest direct energy gap and also for any indirect edges, which lie below the direct gap. In addition, the technique is useful for the study of defects and impurities, which have strong absorption cross sections and that lie in the forbidden gap of the material under study. Electro-absorption and other modulation spectroscopy experiments have enhanced understanding of electronic states in solids but there are still several problems that need to be resolved: (1) an electro-absorption theory for forbidden transitions such as in Cu 2 O, (2) anisotropic effects in the excitonic electro-absorption theory, and (3) a better treatment of broadening effects. These are just a few of the unresolved problems and, undoubtedly, by solving these problems, new problems will be created. All in all, electro-absorption has made a significant contribution toward the understanding of the electronic states in solids.
Published Version
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