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arXiv 1111.4862cond-mat.mes-hallcond-mat.other
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石墨烯中本征电子输运的精确结果

Exact results for intrinsic electronic transport in graphene

Shijie Hu, Wei Du, Guiping Zhang, Miao Gao, Zhong-Yi Lu, Xiaoqun Wang

摘要:

我们提出了确切的结果,石墨烯片连接到两个金属电极的电子输运性质。我们的结果,得到的传递矩阵方法,是有效的所有纸张的宽度和长度。在与最近实验相关的大宽长比的限制下,我们发现扶手椅型石墨烯的$2e^2/\sqrt{3}h$具有Dirac-point电导率,而$2 - 3\sqrt{3}/π\simeq 0.346$具有亚泊松Fano因子;对于锯齿形几何形状,这些分别为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重要影响,从而对石墨烯中独特的固有输运进行了完整的微观理解。

英文摘要:

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 large width-to-length ratio relevant to recent experiments, we find a Dirac-point conductivity of $2e^2/\sqrt{3}h$ and a sub-Poissonian Fano factor of $2 - 3\sqrt{3}/π\simeq 0.346$ for armchair graphene; for the zigzag geometry these 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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