Nonlinearity in the dynamics of photoinduced nucleation process.
Coherent nonlinear dynamics of photoinduced cooperative phenomena at 0 K is studied by numerical calculations on a model of molecular crystals. We found that the photoinduced nucleation process is triggered only when a certain amount of excitation energy is supplied in a narrow part of the system; i.e., there exists the smallest size of the cluster of excited molecules which makes the nucleation possible. As a result, the portion of the cooperatively converted molecules is nonlinearly dependent on the photoexcitation strength, which has been observed in various materials.
Ishida
Kunio
K
Corporate Research and Development Center, Toshiba Corporation, 1 Komukaitoshiba-cho, Saiwai-ku, Kawasaki 212-8582, Japan. ishida@arl.rdc.toshiba.co.jp <ishida@arl.rdc.toshiba.co.jp>
Nasu
Keiichiro
K