The shear mode of multi-layer graphene

Tan, P. H. and Han, W. P. and Zhao, W. J. and Wu, Z. H. and Chang, W. and Wang, H. and Bonini, N. and Marzari, N. and Pugno, Nicola M. and Savini, G. and Lombardo, A. and Ferrari, Andrea C. (2012) The shear mode of multi-layer graphene. In «Nature Materials», vol. 11, London, UK : Nature Publishing Group, pp. 294-300.

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    The quest for materials capable of realizing the next generation of electronic and photonic devices continues to fuel research on the electronic, optical and vibrational properties of graphene. Few-layer graphene (FLG) flakes with less than ten layers each show a distinctive band structure. Thus, there is an increasing interest in the physics and applications of FLGs. Raman spectroscopy is one of the most useful and versatile tools to probe graphene samples. Here, we uncover the interlayer shear mode of FLGs, ranging from bilayer graphene (BLG) to bulk graphite, and suggest that the corresponding Raman peak measures the interlayer coupling. This peak scales from ~43 cm−1 in bulk graphite to ~31 cm−1 in BLG. Its low energy makes it sensitive to near-Dirac point quasiparticles. Similar shear modes are expected in all layered materials, providing a direct probe of interlayer interactions.

    Item Type: Article in journal
    FP7 Grant Agreement Number: European Research Council/ERC Starting grant/EU/FP7/279985
    Department or Research center: Civil, Environmental and Mechanical Engineering
    Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA630 Structural Engineering
    Repository staff approval on: 14 Nov 2013 14:38

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