Observation of out-of-plane vibrations in few-layer graphene

Abstract

We report the observation of layer breathing mode (LBM) vibrations in few-layer graphene (FLG) samples of thickness from 2 to 6 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 identify the feature as the LOZO' 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.

17 pages, 7 figures, supplemental material included

References in corpus (4)

• The phonon dispersion of graphite by inelastic x-ray scattering
• Phonon dispersions and vibrational properties of monolayer, bilayer, and trilayer graphene
• Effects of Layer Stacking on the Combination Raman modes in Graphene
• Raman and Infra-red properties and layer dependence of the phonon dispersions in multi-layered graphene

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