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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 |
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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.
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Received: 12 September 2023
Revised: 07 November 2023
Accepted manuscript online: 13 November 2023
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PACS:
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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71.35.-y
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(Excitons and related phenomena)
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71.38.-k
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(Polarons and electron-phonon interactions)
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72.20.Jv
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(Charge carriers: generation, recombination, lifetime, and trapping)
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| Fund: Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020MA070). |
Corresponding Authors:
Xiao-Xue Li
E-mail: sps_lixx@ujn.edu.cn
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Cite this article:
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 2024 Chin. Phys. B 33 037201
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