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arxiv: 1106.1146 · v1 · pith:MHE6IW3Onew · submitted 2011-06-06 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci

The Shear Mode of Multi-Layer Graphene

P. H. Tan , W. P. Han , W. J. Zhao , Z. H. Wu , K. Chang , H. Wang , Y. F. Wang , N. Bonini
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N. Marzari G. Savini A. Lombardo A. C. Ferrari
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classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci
keywords interlayershearbulkcm-1graphenegraphitemodemulti-layer
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We uncover the interlayer shear mode of multi-layer graphene samples, ranging from bilayer-graphene (BLG) to bulk graphite, and show that the corresponding Raman peak measures the interlayer coupling. This peak scales from~43cm-1 in bulk graphite to~31cm-1 in BLG. Its low energy makes it a probe of near-Dirac point quasi-particles, with a Breit-Wigner-Fano lineshape due to resonance with electronic transitions. Similar shear modes are expected in all layered materials, providing a direct probe of interlayer interactions

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