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Comment on 'Raman spectra of misoriented bilayer graphene'

机译：评论“取向错误的双层石墨烯的拉曼光谱”

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摘要

In a recent paper, Poncharal et al. [Phys. Rev. B 78, 113407 (2008)] studied the Raman spectra of misoriented bilayer graphene. They found that the blueshift of 2D band of misoriented graphene relative to that of single layer graphene shows a strong dependence on the excitation laser energy. The blueshift increases with decreasing excitation energy. This finding contradicts our explanation of reduction in Fermi velocity of folded/ misoriented graphene [Ni et al, Phys. Rev. B 77, 235403 (2008)]. In this Comment, we present more experimental results from our group as well as from others to show that the blueshift is indeed only weakly dependent on excitation energy. We therefore suggest that our explanation of 2D blueshift of folded graphene due to reduction in Fermi velocity is still valid.
机译：在最近的论文中，Poncharal等人。 [物理Rev. B 78，113407（2008）]研究了取向错误的双层石墨烯的拉曼光谱。他们发现，取向不正确的石墨烯的二维带相对于单层石墨烯的二维带蓝移显示出对激发激光能量的强烈依赖性。蓝移随着激励能量的降低而增加。这一发现与我们关于折叠的/取向错误的石墨烯的费米速度降低的解释相矛盾[Ni et al。，Phys。修订版B 77，235403（2008）]。在此评论中，我们提供了来自小组以及其他小组的更多实验结果，以表明蓝移确实仅微弱地依赖于激发能。因此，我们建议我们对由于费米速度降低而导致的折叠石墨烯二维蓝移的解释仍然有效。

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  • 来源
    《Physical review》 |2009年第23期|1185-1186|共2页
  • 作者

    Zhenhua Ni; Yingying Wang; Ting Yu; Yumeng You; Zexiang Shen;

  • 作者单位

    Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;

    Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;

    Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;

    Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;

    Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;

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  • 正文语种 eng
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  • 关键词

    fullerenes and related materials; collective excitations; nanotubes;

    机译：富勒烯及相关物质;集体激励;纳米管;

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