Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer

doi:10.1088/1674-1056/ad0bf1

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 37201-037201.doi: 10.1088/1674-1056/ad0bf1

Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer

Xiao-Xue Li(李晓雪)^1,2,†, Hua Peng(彭华)¹, Dong Wang(王栋)², and Dong Hou(侯栋)²

1 School of Physics and Technology, University of Jinan, Jinan 250022, China;
2 Jinan Institute of Quantum Technology, Jinan 250101, China

收稿日期:2023-09-12 修回日期:2023-11-07 接受日期:2023-11-13 出版日期:2024-02-22 发布日期:2024-02-29
通讯作者: Xiao-Xue Li E-mail:sps_lixx@ujn.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020MA070).

Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer

Xiao-Xue Li(李晓雪)^1,2,†, Hua Peng(彭华)¹, Dong Wang(王栋)², and Dong Hou(侯栋)²

1 School of Physics and Technology, University of Jinan, Jinan 250022, China;
2 Jinan Institute of Quantum Technology, Jinan 250101, China

Received:2023-09-12 Revised:2023-11-07 Accepted:2023-11-13 Online:2024-02-22 Published:2024-02-29
Contact: Xiao-Xue Li E-mail:sps_lixx@ujn.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020MA070).

摘要/Abstract

摘要： By using one-dimensional tight-binding model modified to include electron-electric field interaction and electron-electron interaction, we theoretically explore the polarization process of exciton and biexciton in cis-polyacetylene. The dynamical simulation is performed by adopting the non-adiabatic evolution approach. The results show that under the effect of moderate electric field, when the strength of electron-electron interaction is weak, the singlet exciton is stable but its polarization presents obvious oscillation. With the enhancement of interaction, it is dissociated into polaron pairs, the spin-flip of which can be observed through modulating the interaction strength. For the triplet exciton, the strong electron-electron interaction restrains its normal polarization, but it is still stable. In the case of biexciton, the strong electron-electron interaction not only dissociate it, but also flip its charge distribution. The yield of the possible states formed after the dissociation of exciton and biexciton is also calculated.

关键词: conjugated polymer, exciton, electron-electron interaction, reverse polarization

Abstract: By using one-dimensional tight-binding model modified to include electron-electric field interaction and electron-electron interaction, we theoretically explore the polarization process of exciton and biexciton in cis-polyacetylene. The dynamical simulation is performed by adopting the non-adiabatic evolution approach. The results show that under the effect of moderate electric field, when the strength of electron-electron interaction is weak, the singlet exciton is stable but its polarization presents obvious oscillation. With the enhancement of interaction, it is dissociated into polaron pairs, the spin-flip of which can be observed through modulating the interaction strength. For the triplet exciton, the strong electron-electron interaction restrains its normal polarization, but it is still stable. In the case of biexciton, the strong electron-electron interaction not only dissociate it, but also flip its charge distribution. The yield of the possible states formed after the dissociation of exciton and biexciton is also calculated.

Key words: conjugated polymer, exciton, electron-electron interaction, reverse polarization

中图分类号: (Polymers; organic compounds (including organic semiconductors))

72.80.Le

71.35.-y (Excitons and related phenomena) 71.38.-k (Polarons and electron-phonon interactions) 72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)

Xiao-Xue Li(李晓雪), Hua Peng(彭华), Dong Wang(王栋), and Dong Hou(侯栋). Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer[J]. 中国物理B, 2024, 33(3): 37201-037201.

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Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer

Effect of electron-electron interaction on polarization process of exciton and biexciton in conjugated polymer

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