• 文献标题:   Zone folding effect in Raman G-band intensity of twisted bilayer graphene
  • 文献类型:   Article
  • 作  者:   SATO K, SAITO R, CONG CX, YU T, DRESSELHAUS MS
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   1098-0121
  • 通讯作者地址:   Tohoku Univ
  • 被引频次:   46
  • DOI:   10.1103/PhysRevB.86.125414
  • 出版年:   2012

▎ 摘  要

The G-band Raman intensity is calculated for twisted bilayer graphene as a function of laser excitation energy based on the extended tight binding method. Here we explicitly consider the electron-photon and electron-phonon matrix elements of twisted bilayer graphene to calculate the resonance Raman intensity. The G-band Raman intensity is sensitive to the laser excitation energy and the twisting angle between the layers as a result of folding the electronic energy band structure. The Van Hove energy singularity, which is an electron transition energy between the conduction and valence bands, depends on n - m of the twisting vector (n, m). The relative intensity of the G band as a function of twisting vectors is presented, which should be useful for the experimental identification of the twisting angle.