Abstract
A photoinduced transition from a charge-density-wave (CDW) phase to a charge-polarization (CP) phase has been recently found in a one-dimensional halogen-bridged binuclear platinum complex ${\mathrm{R}}_{4}[{\mathrm{Pt}}_{2}(\mathrm{pop}{)}_{4}\mathrm{I}]n{\mathrm{H}}_{2}\mathrm{O}$ $[\mathrm{pop}={\mathrm{P}}_{2}{\mathrm{O}}_{5}{\mathrm{H}}_{2}^{2\ensuremath{-}},$ $\mathrm{R}=({\mathrm{C}}_{2}{\mathrm{H}}_{5}{)}_{2}{\mathrm{NH}}_{2}].$ Its mechanism is theoretically studied by solving the time-dependent Hartree-Fock equation for a one-dimensional two-band three-quarter-filled Peierls-Hubbard model. Above a threshold in the photoexcitation intensity, a transition takes place from the CDW to CP phases. The threshold intensity depends on the relative stability of these phases, which can be explained qualitatively by their diabatic potentials. However, the transition from the CP to CDW phases is hardly realized for two reasons: (i) low-energy charge-transfer processes occur only within a binuclear unit in the CP phase; (ii) it is difficult for the CDW order to become long ranged owing to its weak coherence. The effective transfer integrals required for the coherence are evaluated.
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