Tight-binding approximation calculation on the electronic structure of graphene and graphene nanoribbons

摘要：

　　The electronic structure expression of graphene was derived using tight-binding approxi -mation method.According to periodic boundary conditions in width direction of graphene nanorib -bons wave vector,the electronic structure analytical expression of armchair graphene nanoribbons was deduced,and the energy band curve were given.The conditions of graphene nanoribbons being metal or semiconductor were obtained.The results show that when nanoribbons width meets L=3na/2,the energy gap is zero and armchair graphene nanoribbons behave as the metallic.With the increase of the nanoribbons width,the energy gap of semiconducting nanoribbons decreases.The electronic properties of graphene nanoribbons are closely related to their geometry.The graphene nanoribbons can be modulated into metal or semiconductor with different band gap by controlling their width.

关键词： graphene armchair graphene nanoribbons tight-binding approximation electronic structure

作者: Hongxia WANG Chenglai YANG Youzhang ZHU Nichen YANG

作者单位: Second Artillery Engineering University,Xian,710025 China

会议类型: 国际会议

会议名称: 2013 International Conference on Energy Research and Power Engineering(2013能源研究与电力工程国际会议)(ERPE2013)

会议地点: 郑州

会议语种:英文

页码: 500-504

在线出版日期: 2013-05-24（万方平台首次上网日期，不代表论文的发表时间）