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

作　　者：李晓雪 彭华 王栋 侯栋 Xiao-Xue Li;Hua Peng;Dong Wang;Dong Hou(School of Physics and Technology,University of Jinan,Jinan 250022,China;Jinan Institute of Quantum Technology,Jinan 250101,China)

机构地区：[1]School of Physics and Technology,University of Jinan,Jinan 250022,China [2]Jinan Institute of Quantum Technology,Jinan 250101,China

出　　处：《Chinese Physics B》2024年第3期556-566,共11页中国物理B（英文版）

基　　金：Project supported by the Natural Science Foundation of Shandong Province,China(Grant No.ZR2020MA070).

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 

分 类 号：O469[理学—凝聚态物理]