石墨烯在应变下的电子结构和量子电导  

Electronic structure and quantum conductance of graphene with strain

作　　者：翟明星[1,2] 王雪峰[2] 蒋永进[1] 

机构地区：[1]浙江师范大学物理系,浙江金华231004 [2]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《苏州大学学报（自然科学版）》2012年第3期57-62,共6页Journal of Soochow University(Natural Science Edition)

基　　金：国家自然科学基金(11074182;10804080;11004174)

摘　　要：基于紧束缚近似模型和格林函数方法研究了石墨烯在弹性应变影响下的能带结构变化,以及扶手椅型纳米带(11-AGNR)的电导谱.单轴应变不能使石墨烯从半金属变成半导体,而双轴应变则能在应变值在20%以内打开石墨烯的能带.半金属的11-AGNR在锯齿和扶手椅方向不对称的应变作用下即会成为半导体,并且电导能隙的宽度会随着应变方向的改变而变化.一个方向拉伸而另一个方向压缩的应变能获得更宽的能隙.We study the effects of elastic strain on the electronic structure of a graphene and the quantum conductance of an armchair graphene nanorribon(11-AGNR) in the tight-binding model combined with the non-equilibrium Green's Function method.A uniaxial strain will not open an energy gap in graphene but biaxial strain can do within deformation of 20%.On the other hand,any strain of not symmetric along the zigzag and armchair directions will open an energy gap in the nanorribon.The width of the energy gap of zero conductance range in energy varies with the orientation of the strain.The maximum width is reached if the strains along the two perpendicular directions are opposite.

关 键 词：紧束缚模型 量子电导 石墨烯 应变 

分 类 号：O61[理学—无机化学]