The photoinduced domino effect for the phase transition dynamics in one-dimensional electron-lattice systems is investigated to clarify the dependence on the friction and interaction between neighboring sites. We find a novel photoinduced domino process in the case of strong intersite interaction and weak friction. In this domino motion, the photoexcited site is still in an excited electronic state, which is in striking contrast to the conventional domino. This mechanism explains the photoinduced phase transitions in systems which have a large-size nucleus of the developing new phase.

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