Reverse Polarization of a High-Energy Exciton in Conjugated Polymers  

作　　者：LI Xiao-Xue DONG Xian-Feng GAO Kun XIE Shi-Jie 李晓雪;董宪峰;高琨;解士杰(School of Physics,and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100)

机构地区：[1]School of Physics,and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100

出　　处：《Chinese Physics Letters》2011年第12期120-123,共4页中国物理快报（英文版）

基　　金：Supported by the National Key Basic Research Program under Grant Nos 2009CB929204 and 2010CB923402;the National Natural Science Foundation under Grant Nos 11174181;the Excellent Youth and Middle Age Scientists Fund of Shandong Province under Grant No BS2009NJ006.

摘　　要：Polarization of a high-energy exciton in conjugated polymers is investigated theoretically by using an extended one-dimensional tight-binding Su–Schrieffer–Heeger(SSH)model.Under an external electric field,the reverse polarization of a high-energy exciton is obtained and the corresponding physical mechanism is analyzed.A critical field Ec is obtained,over which the polarization of the high-energy exciton will switch from negative to positive.In addition,by taking into account the effect of the non-degenerate confinement,we find that it is possible to realize reverse polarization through high energy photoexcitation in non-degenerate polymers.

关 键 词：POLARIZATION DEGENERATE excitation 

分 类 号：O57[理学—粒子物理与原子核物理]