Electronic transport in the multi-terminal graphene nanodevices

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• 作者：En-Jia Ye ; Jin Lan ; Wen-Quan Sui ; Chang Q. Sun ; Xuean Zhao
• 关键词：Admittance ; Green function ; Graphene ribbon
• 刊名：Physics Letters A
• 出版年：2012
• 出版时间：30 July, 2012
• 年：2012
• 卷：376
• 期：37
• 页码：2555-2561
• 全文大小：365 K

文摘

We examined the ac transport attribute of the multi-terminal structures in the absence and presence of magnetic field. We found that the ac response depends on the structural configurations and that the admittance varies with the features of the attached nanoribbons. In the vicinity of Dirac point the dc conductance manifests a dip or peak and the imaginary part (emittance) vanishes or not, depending on whether the attached ribbon is semiconductive or metallic. In the presence of magnetic field, the emittance becomes asymmetric reflecting the dynamic behaviors of electron and hole.