Real-Time Observation of Interlayer Vibrations in Bilayer and Few-Layer Graphene

Abstract : We report real-time observation of the interlayer shearing mode, corresponding; to the lateral oscillation of graphene planes, for bi- and few-layer graphene. Using a femtosecond pump-probe technique, we have followed coherent oscillations of this vibrational mode directly in the time domain. The shearing-mode frequency, as expected for an interlayer mode, exhibits a strong and systematic dependence on the number of layers, varying from 1.32 THz for the bulk limit to 0.85 THz for bilayer graphene. We explored the role of interactions with the external environment on this vibrational mode by comparing the response observed for graphene layers supported by different substrates and suspended in free space. No significant frequency shifts were observed.
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Article dans une revue
Nano Letters, American Chemical Society, 2013, 13 (10), pp.4620 - 4623. 〈10.1021/nl401713h〉
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Contributeur : Pierre Zaparucha <>
Soumis le : mercredi 30 novembre 2016 - 11:25:32
Dernière modification le : jeudi 10 mai 2018 - 01:58:08

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Davide Boschetto, Leandro Malard, Chun Hung Lui, Kin Fai Mak, Zhiqiang Li, et al.. Real-Time Observation of Interlayer Vibrations in Bilayer and Few-Layer Graphene. Nano Letters, American Chemical Society, 2013, 13 (10), pp.4620 - 4623. 〈10.1021/nl401713h〉. 〈hal-01405652〉

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