Exact Results for Intrinsic Electronic Transport in Graphene
Exact Results for Intrinsic Electronic Transport in Graphene
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DOI：
10.1088/0256-307x/29/5/057201
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发表时间：
2011-11
影响因子：
3.5
通讯作者：
Shijie Hu;Wei Du;Gui-Ping Zhang;M. Gao;Zhong-yi Lu;Xiaoqun Wang
中科院分区：
文献类型：
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作者：
Shijie Hu;Wei Du;Gui-Ping Zhang;M. Gao;Zhong-yi Lu;Xiaoqun Wang
我们提出了连接到两个金属电极的石墨烯片的电子输运性质的精确结果。我们用传递矩阵方法得到的结果对所有板材宽度和长度都是有效的。在与最近的实验相关的大宽长比的限制下，我们发现狄拉克点电导率为2e(2)/根3h，亚泊松法诺因子为2 - 3根3/pi，类似或等于0.346；对于之字形几何，它们分别是0和1。我们的研究结果反映了石墨烯的拓扑结构和引线的电子结构的基本影响，从而对石墨烯中独特的本征输运有了完整的微观理解。
We present exact results for the electronic transport properties of graphene sheets connected to two metallic electrodes. Our results obtained by transfer-matrix methods are valid for all sheet widths and lengths. In the limit of the large width-to-length ratio relevant to recent experiments, we find a Dirac-point conductivity of 2e(2)/root 3h and a sub-Poissonian Fano factor of 2 - 3 root 3/pi similar or equal to 0.346 for armchair graphene; for the zigzag geometry they are respectively 0 and 1. Our results reflect essential effects from both the topology of graphene and the electronic structure of the leads, giving a complete microscopic understanding of the unique intrinsic transport in graphene.