单壁碳纳米管中的线性等离子体色散和石墨烯的集体激发谱
Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene
摘要：
我们已经测量了沿着单个单壁碳纳米管的轴的严格线性的π-等离子体激元分散，这与石墨或成束的单壁碳纳米管的等离子体激元分散完全不同。基于石墨烯的系统的比较从头算研究使我们能够再现不同的分散体。这表明个体化的纳米管为石墨烯的集体电子激发提供了可行的实验途径，并且它验证了使用石墨烯来理解碳纳米管的电子激发。特别是，计算表明，局部场效应（LFE）导致电子跃迁的混合，包括“狄拉克锥”，导致观察到的线性色散。
英文摘要：
We have measured a strictly linear pi-plasmon dispersion along the axis of individualized single wall carbon nanotubes, which is completely different from plasmon dispersions of graphite or bundled single wall carbon nanotubes. Comparative ab initio studies on graphene based systems allow us to reproduce the different dispersions. This suggests that individualized nanotubes provide viable experimental access to collective electronic excitations of graphene, and it validates the use of graphene to understand electronic excitations of carbon nanotubes. In particular, the calculations reveal that local field effects (LFE) cause a mixing of electronic transitions, including the 'Dirac cone', resulting in the observed linear dispersion.
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。
