扰动对一维局域模的影响  

Effect of atomic fluctuation on the localized modes in one-dimensional system

作　　者：张大成[1] 王鹿霞[1] 刘德胜[1] 韩圣浩[1] 解士杰[1] 

机构地区：[1]山东大学物理与微电子学院,晶体材料国家重点实验室,济南250100

出　　处：《物理学报》2003年第12期3191-3196,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :90 10 3 0 3 4;10 0 740 40 ;60 1760 2 1)资助的课题~~

摘　　要：在紧束缚模型基础上 ,考虑到缺陷、温度、掺杂等外界因素的影响 ,用方形随机分布模拟了格点原子扰动对一维局域模的影响 .给出了不同扰动参数σ下 ,孤子和极化子中各个局域模的变化情况 .计算发现 ,由于孤子g1 模的钉扎效应 ,扰动后 ,弱模g4 定域性会得到加强 ,还会产生两个新定域模g′1 和g′2 ,它们与相应的g1 和g2 模有相同的节点和宇称 ;极化子的g7模在畸变较大时将消失 ,其交错模g5和g8均是完好的定域模 .In the frame work of the tight-binding approximation, the effect of defects and disorder on the vibrational modes in one- dimensional systems was studied t hrou gh a random distribution model. It was found that the Goldstone mode of a solito n or polaron is pinned and its frequency is shifted up to a finite value. The we ak mode g 4 of a soliton is enhanced. The staggered modes keep their locali zation even if there is a large lattice fluctuation. Some new modes appear when the perfect soliton or polaron configuration is disturbed.

关 键 词：扰动 局域模 导电聚合物 掺杂 紧束缚模型 缺陷 扰动参数 钉扎效应 发光材料 

分 类 号：O482.3[理学—固体物理]