Two-step dissociation of a polaron in conjugated polymers
Liu Xiao-Jing(刘晓静)a), Gao Kun(高琨)a), Li Yuan(李元)a), Wei Jian-Hua(魏建华)a), and Xie Shi-Jie(解士杰)a)b)
a School of Physics and Microelectronics, Shandong University, Jinan 250100, China; b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
Abstract We have studied the electric-field-driven motion of a polaron by solving the time-dependent Schr?dinger 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.
Received: 14 August 2006
Revised: 24 January 2007
Accepted manuscript online:
PACS:
71.38.-k
(Polarons and electron-phonon interactions)
Fund: Project supported by the Major Program of the National Natural Science
Foundation of China (Grant Nos 10474056, 90403110 and 10574082).
Cite this article:
Liu Xiao-Jing(刘晓静), Gao Kun(高琨), Li Yuan(李元), Wei Jian-Hua(魏建华), and Xie Shi-Jie(解士杰) Two-step dissociation of a polaron in conjugated polymers 2007 Chinese Physics 16 2091
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