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arXiv 1208.3446cond-mat.mes-hall
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具有真实边缘的石墨烯纳米带中的量子输运

Quantum Transport in Graphene Nanoribbons with Realistic Edges

Patrick Hawkins, Milan Begliarbekov, Marko Zivkovic, Stefan Strauf, Christopher P. Search

摘要:

由于其独特的电学性质,石墨烯纳米带(GNRs)作为新型电子器件的构建块显示出巨大的前景。然而,这些性质强烈依赖于石墨烯器件边缘的几何形状。到目前为止,只有锯齿形和扶手椅边缘已被广泛研究。然而,其他几种自钝化边缘重建是可能的,并在实验中观察到。在这里,我们利用非平衡格林函数(NEGF)技术结合紧束缚方法来模拟量子输运通过扶手椅,锯齿形,和其他几个自钝化边缘重建。此外,我们认为实验相关的情况下,混合边缘,随机组合的可能终止存在于一个给定的GNR边界。我们发现,通过GNR的自钝化边缘重建的运输是由亚晶格结构的边缘,以类似的方式,他们的父母之字形或扶手椅配置。此外,我们发现,重建扶手椅GNR的具有更大的带隙能量比原始扶手椅边缘和更强大的边缘混乱。这些结果提供了新的见解与现实的边缘GNR的运输,因此是至关重要的GNR为基础的设备的发展。

英文摘要:

Due to their unique electrical properties, graphene nanoribbons (GNRs) show great promise as the building blocks of novel electronic devices. However, these properties are strongly dependent on the geometry of the edges of the graphene devices. Thus far only zigzag and armchair edges have been extensively studied. However, several other self passivating edge reconstructions are possible, and were experimentally observed. Here we utilize the Nonequilibrium Green's Function (NEGF) technique in conjunction with tight binding methods to model quantum transport through armchair, zigzag, and several other self-passivated edge reconstructions. In addition we consider the experimentally relevant cases of mixed edges, where random combinations of possible terminations exist on a given GNR boundary. We find that transport through GNR's with self-passivating edge reconstructions is governed by the sublattice structure of the edges, in a manner similar to their parent zigzag or armchair configurations. Furthermore, we find that the reconstructed armchair GNR's have a larger band gap energy than pristine armchair edges and are more robust against edge disorder. These results offer novel insights into the transport in GNRs with realistic edges and are thus of paramount importance in the development of GNR based devices.

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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