Zone folding effect in Raman G-band intensity of twisted bilayer graphene

Kentaro Sato, Riichiro Saito, Chunxiao Cong, Ting Yu, Mildred S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number125414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number12
DOIs
Publication statusPublished - 2012 Sep 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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