Chinese Physics B,2010年19(9): 097301-1-097301-5 ISSN：1674-1056
[Xu Hui; Ouyang Fang-Ping; Ma Song-Shan; Chen Ling-Na; Xiao Jin; Wu Xiao-Zan] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.;[Chen Ling-Na] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
[Xu Hui] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.
transport properties;negative differential resistance;first-principles;crossed graphene nanoribbons
By using first-principles calculations and nonequilibrium Green's function technique, we study elastic transport properties of crossed graphene nanoribbons. The results show that the electronic transport properties of molecular junctions can be modulated by doped atoms. Negative differential resistance (NDR) behaviour can be observed in a certain bias region, when crossed graphene nanoribbons are doped with nitrogen atoms at the shoulder, but it cannot be observed for pristine crossed graphene nanoribbons at low biases. A mechanism for the negative differential resistance behaviour is suggested.
Using the first-principles calculations, we investigate the electronic band structure and the quantum transport properties of metallic carbon nanotubes (MCNTs) with B/N pair co-doping. The results about formation energy show that the B/N pair co-doping configuration is a most stable structure. We find that the electronic structure and the transport properties are very sensitive to the doping concentration of the B/N pairs in MCNTs, where the energy gaps increase with doping concentration increasing both along the tube axis and around the tube, because the mirror symmetry of MCNT is broken by doping B/N pairs. In addition, we discuss conductance dips of the transmission spectrum of doped MCNTs. These unconventional doping effects could be used to design novel nanoelectronic devices
[刘立; WAN Ya-ping ; 刘朝晖; 黄欣阳] School of Computer Science and Technology, University of South China, Hengyang 421001, China;[刘立] Department of Telecommunication, Huazhong Science and Technology University, Wuhan 430074, China;[刘立 ; 万亚平; 刘朝晖 ; 黄欣阳 ] 南华大学计算机科学与技术学院,衡阳 421001;[刘立 ] 华中科技大学电信系,武汉 430074
[彭复员; 田岩; 刘立] Department of Telecommunication, Huazhong Science and Technology University, Wuhan 430076, China;[万亚平; 刘立] Department of Computer Science and Technology, NanHua University, Hengyang 421001, China
Department of Telecommunication, Huazhong Science and Technology University, China
[任晓; 李斌; 陈坚祯; 卫开夏] School of Mechanical and Electronic Engineering and Automation, Shanghai University, Shanghai 200072, China;[屈国普; 肖基毅; 陈坚祯] School of Computer Science and Technology, Nanhua University, Hengyang 421001, China
School of Mechanical and Electronic Engineering and Automation, Shanghai University, China