Theory for photoinduced structural phase transitions

被引:4
|
作者
Mizouchi, H [1 ]
Ping, H [1 ]
Nasu, K [1 ]
机构
[1] Grad Univ Adv Study, KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan
关键词
photoinduced phase transition; hidden multi-stability; proliferation; TTF-CA; initial condition sensitivity;
D O I
10.1080/01411590108224562
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
A general concept for photoinduced structural phase transitions is developed in terms of the hidden multistability of the ground state and the proliferations of optically excited states. Taking the ionic-neutral (I-N) phase transition in the organic charge transfer crystal, TTF-CA, as a typical example for this type of transition, we, at first, theoretically show an adiabatic path of this transition, which starts from a single charge transfer exciton in the ionic phase, but finally reaches a neutral domain with a macroscopic size. In connection with this I-N transition, the concept of the initial condition sensitivity is also developed so as to clarify experimentally observed nonlinear characteristics of this material. In the next, using a more simplified model for the many-exciton system, we theoretically study the early time quantum dynamics of the exciton proliferation, which finally results in the domain formation of a large number of excitons. For this purpose, we derive a stepwise iterative equation to describe the exciton proliferation, and clarify the origin of the initial condition sensitivity.
引用
收藏
页码:1 / 20
页数:20
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