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物理学报. 1999, 48(11): 2110-2115.
doi: 10.7498/aps.48.2110.
高分子中双激子态对外电场的线性响应
- 收稿日期: 1998-11-19
- 刊出日期: 1999-11-20
摘要: 在外电场中，非简并基态共轭高分子中的双激子具有反向极化的奇异特性.利用响应函数求得高分子链的双激子态在任意频率下的动态极化率χ(ω)，并通过求ω→0极限，给出双激子态的静态极化率χ，证实了χ确实为负值.并与激子态和基态作了比较，分析了分子负极化率的起因.考察了响应函数在低频时的行为，指出激子和双激子的激发浓度增大会导致材料折射率n(ω)向不同方向变化.
English Abstract
THE LINEAR RESPONSE OF BIEXCITON TO EXTERNAL ELECTRICAL FIELD IN POLYMER
- Received Date:
19 November 1998
- Published Online:
20 November 1999
Abstract: In external electrical field,the self-trapping biexciton in non-degenerate ground state conjugated polymer has an abnormal characteristic-its static polarizability was found to be negative.We calculated the dynamic response function χ(ω) of biexciton.By putting ω to the zero limit,we got the static polarizability χ which proved to be negative.We compared it with that of self-trapping exciton and ground state and gave some analysis on the origin of negative polarizability.Finally,we investigated the behavior of χ(ω) when ω is small,and deduced that if more biexcitons are excited,the n(ω) of the material will decrease,whereas if more excitons are excited,the n(ω) will increase.
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