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

研究成果: Article査読

133 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)5539-5544
ページ数6
ジャーナルNano Letters
12
11
DOI
出版ステータスPublished - 2012 11 14

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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