Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 10, Pages 2879-2886Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.2879
Keywords
photoinduced phase transition; neutral-ionic transition; TTF-CA; charge-transfer complex; timedependent Schrodinger equation; dynamics
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Dynamics of charge density and lattice displacements after the neutral phase is photoexcited is studied by solving the time-dependent Schrodinger equation for a one-dimensional extended Peierls-Hubbard model with alternating potentials. In contrast to the ionic-to-neutral transition studied previously, the neutral-to-ionic transition proceeds in an uncooperative manner as far as the one-dimensional system is concerned. The final ionicity is a linear function of the increment of the total energy. After the electric field is turned off, the electronic state does not significantly change, roughly keeping the ionicity, even if the transition is not completed, because the ionic domains never proliferate. As a consequence, an electric field with frequency just at the linear absorption peak causes the neutral-to-ionic transition the most efficiently. These findings are consistent with the recent experiments on the mixed-stack organic charge-transfer complex, TTF-CA. We artificially modify or remove the electron-lattice coupling to discuss the origin of such differences between the two transitions.
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