Identifying the orientation of edge of graphene using G band Raman spectra

Ken Ichi Sasaki, Riichiro Saito, Katsunori Wakabayashi, Toshiaki Enoki

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

The electron-phonon matrix elements relevant to the Raman intensity and Kohn anomaly of the G band are calculated by taking into account the effect of the edge of graphene. The analysis of the pseudospin reveals that the longitudinal optical phonon mode undergoes a strong Kohn anomaly for both the armchair and zigzag edges, and that only the longitudinal (transverse) optical phonon mode is a Raman active mode near the armchair (zigzag) edge. The Raman intensity is enhanced when the polarization of the incident laser light is parallel (perpendicular) to the armchair (zigzag) edge. This asymmetry between the armchair and zigzag edges is useful in identifying the orientation of the edge of graphene.

Original languageEnglish
Article number044603
Journaljournal of the physical society of japan
Volume79
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

Keywords

  • Edge orientation
  • Electron-light interaction
  • Electron-phonon interaction
  • Gauge field
  • Graphene
  • Pseudospin
  • Raman spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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