Resonance effects on the Raman spectra of graphene superlattices

V. Carozo, C. M. Almeida, B. Fragneaud, P. M. Bedê, M. V.O. Moutinho, J. Ribeiro-Soares, N. F. Andrade, A. G. Souza Filho, M. J.S. Matos, B. Wang, M. Terrones, Rodrigo B. Capaz, A. Jorio, C. A. Achete, L. G. Cançado

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Abstract

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 θ 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 θ dependence of the tBLG electronic structure, as calculated by ab initio methodologies. The twist angle θ 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).

Original languageEnglish (US)
Article number085401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number8
DOIs
StatePublished - Aug 2 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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