Abstract
Optical absorption spectra in a one-dimensional strongly correlated electron system are discussed with halogen-bridged Ni complexes as target materials. In particular, we have interest in the interplay between strong electron-electron interaction and at least intermediate electron-lattice interaction, because very small Raman Stokes shifts were observed and interpreted as suppression of the latter interaction. We thus treat the former interaction by a dynamical density-matrix renormalization group method and incorporate the latter interaction semiclassically. As a result, we again find the suppression of the electron-lattice interaction, which now manifests as a very sharp spectral width. The magnitude of broadening obtained almost reproduces that observed in a Br-bridged Ni system. Furthermore, we also show other one-dimensional cases that do not manifest such suppression, including a Holstein-type coupling case and a charge-density-wave system, and clarify the origin of such variety.
Published Version
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