扶手椅形石墨烯纳米带的电子输运性质  

Electron Transport Properties of Armchair Graphene Nanoribbons

作　　者：李健文[1] 朱昊天 胡军平 何玉平[1] 桂卫军[1] 徐成勇 LI Jian-wen;ZHU Hao-tian;HU Jun-ping;HE Yu-ping;GUI Wei-jun;XU Cheng-yong(School of Science,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院理学院,江西南昌330099

出　　处：《宜春学院学报》2021年第6期29-32,共4页Journal of Yichun University

基　　金：江西省教育厅科学技术研究项目(项目编号:GJJ190962);江西省自然科学基金青年基金项目(项目编号:20202BABL211008);江西省大学生创新创业训练计划项目(项目编号:S202011319009)。

摘　　要：利用基于紧束缚模型的非平衡格林函数方法研究了扶手椅形石墨烯纳米带的输运特性。详细给出了倍增算法递归过程。运用该算法计算电极的表面格林函数,减少了数值计算时间,使我们能够研究较大的系统。我们专注于不同宽度的中心器件的能带结构、透射系数和态密度。数值结果表明,中心器件的宽度决定了系统具有金属性还是半导体性。透射系数出现了量子化台阶。随着中心器件的宽度的增大,可用的电子能带的数目在增加,透射系数的台阶数也在增加。电子能带增加一条时,电子通道多开辟一个,透射系数也多增加一个台阶。The transport properties of armchair graphene nanoribbons(AGNRS)were studied by using the nonequilibrium Green function method based on tight binding model.The recursive process of multiplication algorithm was given in detail.The algorithm was used to calculate the surface Green's function of the electrode.It reduced the numerical calculation time and contributed to studying larger systems.The band structure,transmission coefficient,and density of states of central devices with different widths were emphasized.The numerical results showed that the width of the central device determined whether the system was metal or semiconductor.Moreover,quantization steps appeared in the transmission coefficient.With the increase of the width of the central device,the number of available electron bands and the number of steps of the transmission coefficient increased.When one more electron band was added,one more electron channel was opened up and the transmission coefficient increased by one step.

关 键 词：石墨烯 紧束缚模型 递归格林函数 输运性质 

分 类 号：O484[理学—固体物理]