碳纳米管电子动力学的管径和螺旋度相关性研究  

A Study of the Correlation Between Tube-diameter and Chirality in Electronic Dynamics of Single-walled Carbon Nanotubes

作　　者：杨成英[1] 丁建文[2] 

机构地区：[1]广东工业大学华立学院,广东增城511325 [2]湘潭大学材料与光电物理学院,湖南湘潭411105

出　　处：《广东工业大学学报》2008年第4期5-8,20,共5页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(10674113;10374046);湖南省自然科学基金资助项目(04JJ3041);湖南省教育厅科学研究基金(03B039)资助项目

摘　　要：考虑碳纳米管的有限尺寸及可能存在的无序,基于量子扩散理论,研究了电子在不同管径和螺旋度的单壁碳纳米管中的量子扩散行为.结果表明,随着无序度的增加,电子在不同管径和螺旋度管中的扩散行为将发生弹道-非弹道转变.有趣的是,无序和缺陷对不同管径和螺旋型碳纳米管中电子输运的影响程度不同.对大管径的纳米管,无序和缺陷的影响要比小管径的小,而对不同螺旋型管,无序和缺陷对锯齿型管的影响要比扶手型管的强.Regarding both the finite size and the disorder, the dynamic behavior of electron in the single-walled carbon nanotubes with various tube-diameter and chirality is studied in terms of quantum diffusion theory. The resuits show that there exists a transition from ballistic to nonballistic behavior with the disorder strength increasing. Interestingly, the disorder and defect have different influences on the electronic transport in the nanotubes with various tube-diameter and/or chirality. For the larger tube-diameter nanotubes, the disorder and defect have less influence on the electronic transport than in nanotubes with smaller tube-diameter. For the nanotuhes with various chirality, the influence on the electronic transport in zigzag nanotubes is stronger than in armchair nanotubes. The results will contribute understanding the strange transport properties of carbon nanotubes and their potential applications.

关 键 词：碳纳米管 量子扩散 自关联函数 均方位移 

分 类 号：O413.1[理学—理论物理]