Volume 117, Number 2, January 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 March 2017|
Dynamic dissociation of trions in conjugated polymers
1 College of Information Science and Engineering, Hebei Engineering Research Center for Information Technology in Population Health, Hebei North University - Zhangjiakou 075000, China
2 College of Physics, Hebei Advanced Thin Films Laboratory, Hebei Normal University - Shijiazhuang 050024, China
3 Department of Physics, Xingtai University - Xingtai 054001, China
4 Zhangjiakou Vocational and Technical College - Zhangjiakou 075051, China
Received: 4 January 2017
Accepted: 15 February 2017
Within a one-dimensional tight-binding model, the dynamic dissociation processes of trions under an external electric field have been investigated using a nonadiabatic evolution method. We demonstrate that the dissociation of the trion under an applied electric field is more difficult than in the case for either the polaron or the bipolaron. Considering the effect of the electron-electron interactions, it is found that the on-site Coulomb interactions reduce while the nearest-neighbor interactions enhance the stability of the trion. Furthermore, due to the competition between the on-site Coulomb and the nearest-neighbor interactions, the static trion presents two typical configurations in general, i.e., a bound state of an exciton and a polaron or a bound state of a bipolaron and an opposite charged polaron. Accordingly, the outcome of the trion dissociation is closely related to its static configuration.
PACS: 71.35.Pq – Charged excitons (trions) / 71.20.Rv – Polymers and organic compounds / 71.15.Pd – Molecular dynamics calculations (Car-Parrinello) and other numerical simulations
© EPLA, 2017
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