期刊
NANO RESEARCH
卷 6, 期 4, 页码 269-274出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-013-0304-z
关键词
twisted bilayer graphene; Raman spectroscopy; phonon branches
类别
资金
- Fonds de la Recherche Scientifique (FNRS)
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)
Bilayer graphene with a twist angle theta between the layers generates a superlattice structure known as a Moir, pattern. This superlattice provides a theta-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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