Abstract
An electron in an isulating solid induces a local lattice distortion around itself,when it is excited by a photon. This phenomenon called “lattice relaxation” of an optical excitation has been studied in various kinds of insulating solids. However, according to the conventional concept of this relaxation, it is tacitly assumed to be a microscopic phenomenon in the sense that only few atoms and electrons are involved. In the recent years,on the other hand, there have been appeared various new unconventionally photo-active solids, where the relaxation of optical excited states results in a semi-macroscopic excited domain with a new structural order different from the original one. This situation can be called “photo-induced structural phase transition”. In this paper, we review our recent theoretical studies on this problem.
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