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Raman scattering study of the phonon dispersion in twisted bilayer graphene

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Abstract

Bilayer graphene with a twist angle θ between the layers generates a superlattice structure known as a Moiré pattern. This superlattice provides a θ-dependent q wavevector that activates phonons in the interior of the Brillouin zone. Here we show that this superlattice-induced Raman scattering can be used to probe the phonon dispersion in twisted bilayer graphene (tBLG). The effect reported here is different from the widely studied double-resonance in graphene-related materials in many aspects, and despite the absence of stacking order in tBLG, layer breathing vibrations (namely ZO’ phonons) are observed.

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Correspondence to Jessica Campos-Delgado.

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Campos-Delgado, J., Cançado, L.G., Achete, C.A. et al. Raman scattering study of the phonon dispersion in twisted bilayer graphene. Nano Res. 6, 269–274 (2013). https://doi.org/10.1007/s12274-013-0304-z

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  • DOI: https://doi.org/10.1007/s12274-013-0304-z

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