• 文献标题:   Resonance effects on the Raman spectra of graphene superlattices
  • 文献类型:   Article
  • 作  者:   CAROZO V, ALMEIDA CM, FRAGNEAUD B, BEDE PM, MOUTINHO MVO, RIBEIROSOARES J, ANDRADE NF, SOUZA AG, MATOS MJS, WANG B, TERRONES M, CAPAZ RB, JORIO A, ACHETE CA, CANCADO LG
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Inst Nacl Metrol Normalizacao Qualidade Ind INM
  • 被引频次:   65
  • DOI:   10.1103/PhysRevB.88.085401
  • 出版年:   2013

▎ 摘  要

In this work, a study of resonance effects in the Raman spectra of twisted bilayer graphene (tBLG) is presented. The analysis takes into account the effect of the mismatch angle theta between the two layers, and also of the excitation laser energy on the frequency, linewidth, and intensity of the main Raman features, namely the rotationally induced R band, the G band, and the second-order G' (or 2D) band. The resonance effects are explained based on the theta dependence of the tBLG electronic structure, as calculated by ab initio methodologies. The twist angle theta also defines the observation of a "D-like" band which obeys the double-resonance process, but relies on the superlattice along with long-range defects in order to fulfill momentum conservation. The study was possible due to the development of a route to produce and identify rotationally stacked bilayer graphene by means of atomic force microscopy (AFM).