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The relation between an exciton and a plasmon in insulators is investigated from a view-point of an electron-hole pair approximation. It is shown that the usual exciton model is valid in the insulator having appreciably localized wave functions and that if the wave functions are not appreciably localized but rather extended, a plasmonlike excitation becomes possible and appears above the continuum pair-band besides the exciton level below it. These behaviors are discussed in comparison with experimental facts.
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Chiuji Horie (1959) studied this question.
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