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

Davide Boschetto 1, 2 Leandro Malard 2 Chun Hung Lui 2 Kin Fai Mak 2 Zhiqiang Li 2 Hugen Yan 2 Tony F. Heinz 2
1 LOA - Laboratoire d'optique appliquée
2 Colombia University
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.
Keywords : Graphene ultrafast spectroscopy coherent phonon dynamics adlayer and substrate interactions
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Journal articles
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https://hal-ensta-paris.archives-ouvertes.fr//hal-01405652
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Submitted on : Wednesday, November 30, 2016 - 11:25:32 AM
Last modification on : Wednesday, July 3, 2019 - 10:48:03 AM

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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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