准一维纳米线电子动力学的量子尺寸效应  

Quantum Size Effects on Electronic Dynamics of Quasi-one-dimensional Nanowires

作　　者：杨成英[1] 陈勇 

机构地区：[1]广东工业大学华立学院,广东广州511325 [2]广州从兴电子科技有限公司,广东广州510300

出　　处：《广东工业大学学报》2009年第2期16-19,共4页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(10674113和10374046);湖南省自然科学基金资金项目(04JJ3041);湖南省教育厅科学研究基金资助项目(03B039);"十一五"国家级课题资助项目(FIB070335-B3-05)

摘　　要：考虑准一维纳米材料的有限尺寸及可能存在的无序,基于量子扩散理论,研究了电子在准一维纳米线中的量子动力学行为.结果表明,随着无序度的增加,电子的扩散行为由弹道向局域的转变,与二维准周期体系类似.存在一定的无序时,随纳米线宽度的增加,同样可观察到弹道和非弹道行为的转变,呈现明显的量子尺寸效应.结果对理解准一维纳米结构体系的奇异输运行为及其潜在应用有参考意义.Both the finite size and the disorder considered, it explores the dynamic behavior of electron in the finitewidth nanowires and carbon nanotubes in terms of the quantum diffusion theory. The results show that there exists a transition from ballistic to localized behavior with the disorder strength increasing, similar to that in two-dimensional quasiperiodic systems. For a given disorder, the ballistic-nonballistic transition is also obtained with the nanowire width increasing, exhibiting a typical quantum size effect. In addition, the disorder and defect have less influence on the electronic transport in the nanotubes than in general nanowires, indicating the high conductivity of quasi-one-dimensional carbon nanotubes. The results can contribute to understanding the strange transport properties of quasione-dimensional nano-structured systems and their potential applications.

关 键 词：纳米线 量子扩散 自关联函数 均方位移 

分 类 号：O413.1[理学—理论物理]