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Raman scattering study of the phonon dispersion in twisted bilayer graphene |
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| Authors: | Jessica Campos-Delgado Luiz G. Cançado Carlos A. Achete Ado Jorio Jean-Pierre Raskin | |
| Affiliation: | 1304. Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Université catholique de Louvain, Louvain-la-Neuve, 1348, Belgium 2304. Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 30123-970, Brazil 3304. Divis?o de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Xerém, RJ, 25250-020, Brazil |
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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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