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arXiv 1003.5955cond-mat.mes-hallcond-mat.str-el
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杂质辅助的石墨烯等离子体激发的纳米尺度局域化

Impurity assisted nanoscale localization of plasmonic excitations in graphene

Rodrigo A. Muniz, Hari P. Dahal, A. V. Balatsky, Stephan Haas

摘要:

使用确定随机相位近似内的非局部介电响应的实空间理论,计算原始和杂质掺杂的石墨烯的等离子体激元模式。一个完整的对角化的极化运营商进行,允许提取其所有极点。它演示了如何杂质诱导形成的本地化模式是不存在的原始石墨烯。讨论了局域等离子体激元的空间调制和频率对电子填充和杂质强度的依赖关系。此外,它示出的化学势和杂质强度可以调谐到控制的局域模式的目标功能。这些预测可以通过扫描隧道显微镜实验进行测试。

英文摘要:

The plasmon modes of pristine and impurity doped graphene are calculated, using a real-space theory which determines the non-local dielectric response within the random phase approximation. A full diagonalization of the polarization operator is performed, allowing the extraction of all its poles. It is demonstrated how impurities induce the formation of localized modes which are absent in pristine graphene. The dependence of the spatial modulations over few lattice sites and frequencies of the localized plasmons on the electronic filling and impurity strength is discussed. Furthermore, it is shown that the chemical potential and impurity strength can be tuned to control target features of the localized modes. These predictions can be tested by scanning tunneling microscopy experiments.

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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