简并破却项对反式聚乙炔中极化子单激发态的影响  

Effect of Degeneracy Breaking Parameters on Single Excited State of Polaron in the Trans-polyacetylene

作　　者：陈少波[1] 常刘安[2] 陈英[1] 张殿喜[1] Chen Shaobo;Chang Liuan;Chen Ying;Zhang Dianxi(College of Electronic and Information Engineering 9Anshun University ,Anshun GuiZhou 561000;Department of Physics and Institute of Condensed Matter Physics,Chongqing University,Chongqing 401331)

机构地区：[1]安顺学院电子与信息工程学院,贵州安顺561000 [2]重庆大学物理学院凝聚态物理研究所,重庆401331

出　　处：《河南科技》2016年第11期136-139,共4页Henan Science and Technology

基　　金：安顺学院2015年度青年项目(2015AQ08);贵州省科技厅三方联合科技基金(黔科合LH字[2015]7696号)

摘　　要：本文采用紧束缚模型加上长程电子关联项哈密顿量模型,研究了反式聚乙炔中极化子的单电子激发,分析了其单激发态的物理性质。与极化子相比,其单激发态体系能带中央的两条定域能级相互靠拢,近乎重合,形成了束缚较弱的孤子-反孤子对。此外,研究简并破缺参数对极化子单激发态反向极化的影响发现,基态简并聚乙炔中的极化子单激发态的反向极化最强,随着te的增大反向极化减弱,当te增大到一定值时,反向极化消失。In this paper, physical property of single excited state of polaron in the trans-polyacetylene was investiga tedtheoretically by using the tight-binding SSH model and long range electric correction model. It was found that localized energy levels in the energy gap were closer to each other compared with polaron9 s resulting in forming a weaker-binding soliton-antisoliton pairs. In addiction, the effects of degeneracy breaking parameters on polarization inversion of a single excited polaron was studied. It was found that the degree of polarization inversion of single-excited state of polaron in polyacetylene with degenerate ground state was largest and it would decrease with te, polarization inversion would disappear at a critical degeneracy breaking parameter.

关 键 词：极化子 单激发态 长程电子关联 简并破缺 

分 类 号：O632.17[理学—高分子化学]