Observation of layer-breathing mode vibrations in few-layer graphene through combination raman scattering

Chun Hung Lui, Leandro M. Malard, Sukhyun Kim, Gabriel Lantz, François E. Laverge, Riichiro Saito, Tony F. Heinz

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)

Abstract

We report the observation of layer-breathing mode (LBM) vibrations in few-layer graphene (FLG) samples of thickness from two to six layers, exhibiting both Bernal (AB) and rhombohedral (ABC) stacking order. The LBM vibrations are identified using a Raman combination band lying around 1720 cm-1. From double resonance theory, we assign the feature as the LO+ZO' combination mode of the out-of-plane LBM (ZO') and the in-plane longitudinal optical mode (LO). The LOZO' Raman band is found to exhibit multiple peaks with a unique line shape for each layer thickness and stacking order. These complex line shapes of the LOZO'-mode arise both from the material-dependent selection of different phonons in the double-resonance Raman process and from the detailed structure of the different branches of LBM in FLG.

Original languageEnglish
Pages (from-to)5539-5544
Number of pages6
JournalNano Letters
Volume12
Issue number11
DOIs
Publication statusPublished - 2012 Nov 14

Keywords

  • Graphene
  • Raman
  • combination mode
  • few layer
  • layer-breathing mode
  • stacking order

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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