Chin. Phys. Lett.  2011, Vol. 28 Issue (12): 123601    DOI: 10.1088/0256-307X/28/12/123601
ATOMIC AND MOLECULAR PHYSICS |
Reverse Polarization of a High-Energy Exciton in Conjugated Polymers
LI Xiao-Xue, DONG Xian-Feng, GAO Kun, XIE Shi-Jie**
School of Physics, and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100
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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.
Keywords: 36.20.-r      71.35.Aa      71.38.-k     
Received: 19 September 2011      Published: 29 November 2011
PACS:  36.20.-r (Macromolecules and polymer molecules)  
  71.35.Aa (Frenkel excitons and self-trapped excitons)  
  71.38.-k (Polarons and electron-phonon interactions)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/12/123601       OR      https://cpl.iphy.ac.cn/Y2011/V28/I12/123601
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LI Xiao-Xue
DONG Xian-Feng
GAO Kun
XIE Shi-Jie
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