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arXiv 1503.00905cond-mat.mes-hall
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石墨烯边缘掺杂的自洽模型

Self-consistent model of edge doping in graphene

Thomas Garm Pedersen

摘要:

位于纳米结构石墨烯边缘附近的掺杂剂的行为与体掺杂剂不同。最值得注意的是,转移到离域状态的电荷量(即掺杂效率)取决于位置以及边缘手性。我们应用自洽的紧束缚模型来分析这个问题,重点是替代氮和硼掺杂。使用格林函数技术,可以研究非常大的结构,避免了周期性重复模拟单元中掺杂剂之间的人工相互作用。我们发现明显的签名的边缘在当地的杂质态密度。重要的是,掺杂效率被发现振荡与亚晶格位置,特别是,掺杂剂附近的锯齿形边缘。最后,为了评估电子-电子相互作用的影响,我们计算了自能校正的格林函数。

英文摘要:

Dopants positioned near edges in nanostructured graphene behave differently from bulk dopants. Most notable, the amount of charge transferred to delocalized states (i.e. doping efficiency) depends on position as well as edge chirality. We apply a self-consistent tight-binding model to analyze this problem focusing on substitutional nitrogen and boron doping. Using a Greens function technique, very large structures can be studied and artificial interactions between dopants in periodically repeated simulations cells are avoided. We find pronounced signatures of edges in the local impurity density of states. Importantly, the doping efficiency is found to oscillate with sublattice position, in particular, for dopants near zigzag edges. Finally, to assess the effect of electron-electron interactions, we compute the self-energy corrected Greens function.

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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