开口悬挂端对单壁碳纳米管电子输运特性的影响  

Effects of open dangling end on the transport properties of single-wall carbon nanotubes

作　　者：陈钦[1] 李统藏[1] 石勤伟[2] 王晓平[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026 [2]中国科学技术大学合肥微尺度物质科学国家实验室,合肥230026

出　　处：《物理学报》2005年第8期3962-3966,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10274076;90406009);中国科学院知识创新工程重大项目(批准号:KJCX1-SW-07)资助的课题~~

摘　　要：采用紧束缚模型研究了悬挂端对单壁碳纳米管电子输运特性的影响.结果表明:有限长悬挂端开口碳纳米管的电导在费米能级附近作周期性振荡.椅型(armchair)碳纳米管的振荡同时具有快、慢两个准周期,而锯齿型(zigzag)碳纳米管的振荡仅有一个周期;碳纳米管电导在费米能级附近的振荡周期随着悬挂端的增长而减小.研究还发现:有限长悬挂端开口碳纳米管的平均电导随探针与碳纳米管间耦合强度的增加而增大,其大小约为无限长悬挂端开口碳纳米管平均电导的两倍.The effects of the dangling end on the electronic transport properties of the single-wall carbon nanotubes (CNTs) have been investigated, based on the tight-binding model and Landau formula. It is found that the conductance oscillates periodically near the Fermi energy in the CNT with a finite-length open dangling end. Both slow and rapid oscillations occur in armchair CNTs, but only the rapid oscillation appears in zigzag ones. The period of the rapid oscillation decreases with increasing the length of the dangling end. Moreover, the mean conductance of the CNTs with finite-length open dangling end is about twice as that with infinite-length open dangling end. Some relevant application is also discussed.

关 键 词：电子输运特性 单壁碳纳米管 悬挂 开口 费米能级 周期性振荡 紧束缚模型 耦合强度 振荡周期 有限长 电导 准周期 锯齿型 无限长 平均 

分 类 号：TB383[一般工业技术—材料科学与工程]