磁场对单壁碳纳米管电子结构的影响  

The Effect of Magnetic Field on the Electronic Structure of Carbon Nanotubes

作　　者：杨云青[1] 王蜀霞[1] 胡慧君[1] 饶早英[1] 牛君杰[1] 

机构地区：[1]重庆大学数理学院应用物理系,重庆400044

出　　处：《山西师范大学学报（自然科学版）》2008年第1期62-66,共5页Journal of Shanxi Normal University(Natural Science Edition)

基　　金：重庆市自然科学基金计划项目资助(CSTC;2006BB4018)

摘　　要：利用"石墨近似",讨论了施加轴向匀强磁场对理想单壁碳纳米管电子结构的影响,建立了相应模型并采用π电子紧束缚近似法,对Zigzag型碳管进行了理论分析与计算.计算表明磁场中SWNTs的子能带和磁通量是量子化的,其能带以磁通量子0为周期随磁通作周期性变化;并出现金属-半导体性的周期性转变现象.Based on graphene sheet approximation,the effect of magnetic field parallel to the axial direction on the electronic structure of carbon nanotubes is discussed. Adopting a single π-band tight-binding modle, the electronic structure of the Zigzag single-wall carbon nanotubes is analyzed in this paper. It shows that the magnetic flux φ is quantized, and the electronic structure and energy gap periodically change with a period φ0 （=h/e）. And the insulator-metal transition about SWNTs occured under theeven axial magnetic field.

关 键 词：碳纳米管 电子结构 紧束缚近似 磁通量 

分 类 号：O481.1[理学—固体物理]