Abstract
Exciton effect on interband absorption in a one-dimensional semiconductor with a dimerization gap is studied theoretically. An important role of the delocalization length is pointed out, and the peculiarity of the lowest singlet exciton state is elucidated by calculating the one- and the two-photon spectra. Results are compared with experiments in polydiacetylene, polysilane, and halogen-bridged mixed-valence platinum complexes.
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