Two-step dissociation of a polaron in conjugated polymers |
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Authors: | Liu Xiao-Jing Gao Kun Li Yuan Wei Jian-Hua and Xie Shi-Jie |
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Affiliation: | School of Physics and Microelectronics, Shandong University, Jinan 250100, China; State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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Abstract: | We have studied the electric-field-driven motion of a polaron by solving the
time-dependent Schr\"{o}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. |
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Keywords: | conjugated polymer polaron dynamics |
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