Two-step dissociation of a polaron in conjugated polymers  

作　　者：刘晓静 高琨 李元 魏建华 解士杰 

机构地区：[1]School of Physics and Microelectronics, Shandong University, Jinan 250100, China [2]State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

出　　处：《Chinese Physics B》2007年第7期2091-2095,共5页中国物理B（英文版）

基　　金：Project supported by the Major Program of the National Natural Science Foundation of China （Grant Nos 10474056, 90403110 and 10574082）.

摘　　要：We have studied the electric-field-driven motion of a polaron by solving the time-dependent SchrSdinger equation nonadiabatically and the lattice equation of motion simultaneously. It is found that the polaron may experience two sequent transitions under high fields; one is the transition from the subsonic to the supersonic state, and the other from the supersonic to dissociated state. The acoustic mode is decoupled from the charge when the polaron moves at a speed faster than the sound speed, and then the optical mode is decoupled at the second transition to make the polaron dissociate completely.We have studied the electric-field-driven motion of a polaron by solving the time-dependent SchrSdinger equation nonadiabatically and the lattice equation of motion simultaneously. It is found that the polaron may experience two sequent transitions under high fields; one is the transition from the subsonic to the supersonic state, and the other from the supersonic to dissociated state. The acoustic mode is decoupled from the charge when the polaron moves at a speed faster than the sound speed, and then the optical mode is decoupled at the second transition to make the polaron dissociate completely.

关 键 词：conjugated polymer POLARON DYNAMICS 

分 类 号：O41[理学—理论物理]