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Photoinduced melting of charge order is calculated by using the exactmany-electron wave function coupled with classically treated phonons in theone-dimensional quarter-filled Hubbard model with Peierls and Holstein types ofelectron-phonon couplings. The model parameters are taken from recentexperiments on (EDO-TTF)_2PF_6 (EDO-TTF=ethylenedioxy-tetrathiafulvalene) with(0110) charge order, where transfer integrals are modulated by moleculardisplacements (bond-coupled phonons) and site energies by moleculardeformations (charge-coupled phonons). The charge-transfer photoexcitation from(0110) to (0200) configurations and that from (0110) to (1010) configurationshave different energies. The corresponding excited states have different shapesof adiabatic potentials as a function of these two phonon amplitudes. Theadiabatic potentials are shown to be useful in understanding differences in thephotoinduced charge dynamics and the efficiency of melting, which depend notonly on the excitation energy but also on the relative phonon frequency of thebond- and charge-coupled phonons.

Photoinduced melting of charge order in a quarter-filled electron system coupled with different types of phonons