Abstract
We report that bi-directional neutral-ionic (N-I) phase transition in the single crystal of tetrathiafulvalene-chloranil (TTF-CA) can be triggered by pulsed laser excitation with 100 femto-second width. The excitation intensity dependence of the dynamics of N-I domain-wall indicates that cooperative electron-lattice and/or electron-electron interactions play a key role in the driving mechanism of N-I photoinduced phase transition.
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