  Employing the one-dimensional single-band extended Peierls-Hubbard model, we
investigate optical conductivity for solitonic excitations in halogen-bridged
binuclear metal (MMX) complexes. Photoinduced soliton absorption spectra for
MMX chains possibly split into two bands, forming a striking contrast to those
for conventional mononuclear metal (MX) analogs, due to the broken
electron-hole symmetry combined with relevant Coulomb and/or electron-phonon
interactions.

Strongly Correlated Electrons