褶皱石墨带的电子输运性质(英文)  

Transport Properties of Corrugated Graphene Nanoribbons

作　　者：徐宁[1] 张超[2] 孔凡杰[1] 史友进[1] 

机构地区：[1]盐城工学院物理系,江苏盐城224051 [2]徐州空军学院机场工程系,江苏徐州221000

出　　处：《物理化学学报》2011年第9期2107-2110,共4页Acta Physico-Chimica Sinica

基　　金：supported by the National Natural Science Foundation of China (10874052);Foundation for the Author of National Excellent Doctoral Dissertation of China (200726);Natural Science Foundation of Jiangsu Province,China (BK2010499);Natural Science Fund for Collegesand Universities in Jiangsu Province,China (11KJB140012);General Program of Yancheng Institute of Technology,China (XKY2011014)~~

摘　　要：利用递推格林函数方法,我们研究了褶皱石墨带的电子输运性质.当石墨带具有褶皱时,对于锯齿型石墨带,在第一个范霍夫奇点内,发现了电导隙和伴随着电导振荡的微带.然而,对于金属性扶手型石墨带,在费米能附近仅发现了电导隙,说明扶手型石墨带发生了金属-半导体转变.随着石墨带的褶皱加强,无论是锯齿型还是扶手型石墨带,平均电导都逐渐减小,并趋于0.结果有利于我们理解真实构型石墨带的电子输运性质,并且有助于设计基于石墨带的纳米器件.We studied the transport properties of corrugated graphene nanoribbons by the recursive Green function method. We show that in the presence of ripples the minigaps with zero conductance and minibands with conductance fluctuations form in the zigzag ribbons among the first Van Hove singularity. For the metal armchair ribbons a conductance gap is present in the vicinity of the Fermi energy, which corresponds to a metal-semiconductor transition. With the fluctuation of ripples intensifying the overall averaged conductance decreases for both the zigzag and armchair ribbons and it tends to be zero. These results are useful for a better understanding of the electronic transport properties of realistic graphene nanoribbons and will be helpful for the design of nanodevices based on graphene.

关 键 词：紧束缚模型 格林函数 石墨带 电导 

分 类 号：O481[理学—固体物理]