Physics – Condensed Matter – Materials Science
Scientific paper
2002-11-21
Physics
Condensed Matter
Materials Science
9 pages, 10 figures, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.72.2282
Real-time dynamics of charge density and lattice displacements is studied during photoinduced ionic-to-neutral phase transitions by using a one-dimensional extended Peierls-Hubbard model with alternating potentials for the one-dimensional mixed-stack charge-transfer complex, TTF-CA. The time-dependent Schr\"odinger equation and the classical equation of motion are solved for the electronic and lattice parts, respectively. We show how neutral domains grow in the ionic background. As the photoexcitation becomes intense, more neutral domains are created. Above threshold intensity, the neutral phase is finally achieved. After the photoexcitation, ionic domains with wrong polarization also appear. They quickly reduce the averaged staggered lattice displacement, compared with the averaged ionicity. As the degree of initial lattice disorder increases, more solitons appear between these ionic domains with different polarizations, which obstruct the growth of neutral domains and slow down the transition.
Kuwabara Makoto
Miyashita Naoyuki
Yonemitsu Kenji
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