| ATOMIC AND MOLECULAR PHYSICS |
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Reverse Polarization of a High-Energy Exciton in Conjugated Polymers |
| LI Xiao-Xue, DONG Xian-Feng, GAO Kun, XIE Shi-Jie**
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School of Physics, and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100
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| Cite this article: |
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LI Xiao-Xue, DONG Xian-Feng, GAO Kun et al 2011 Chin. Phys. Lett. 28 123601 |
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Abstract Polarization of a high-energy exciton in conjugated polymers is investigated theoretically by using an extended one-dimensional tight-binding Su–Schrieffer–Heeger (SSH) model. Under an external electric field, the reverse polarization of a high-energy exciton is obtained and the corresponding physical mechanism is analyzed. A critical field Ec is obtained, over which the polarization of the high-energy exciton will switch from negative to positive. In addition, by taking into account the effect of the non-degenerate confinement, we find that it is possible to realize reverse polarization through high energy photoexcitation in non-degenerate polymers.
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| Keywords:
36.20.-r
71.35.Aa
71.38.-k
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Received: 19 September 2011
Published: 29 November 2011
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| PACS: |
36.20.-r
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(Macromolecules and polymer molecules)
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71.35.Aa
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(Frenkel excitons and self-trapped excitons)
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71.38.-k
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(Polarons and electron-phonon interactions)
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