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Howtoexcitethebiexctionsinapolymerisanessentialsubject,sincethebiexcitonpossessesaneffectofphoto inducedpolarizationreversion.Thispaperproposesanewchanneltoproducethebiexcitonthroughtwo electronexcitation.Therelaxationprocessesofbothlatticedistortionandelectronicstatesaresimulatedbystudyingitsdynamics,andtherelaxationtimeofbiexcitonformationandpolarizationreversionisdetermined .







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