title: Raman signature of graphene superlattices.
abstract: When two identical two-dimensional periodic structures are superposed, a mismatch rotation angle between the structures generates a superlattice. This effect is commonly observed in graphite, where the rotation between graphene layers generates Moiré patterns in scanning tunneling microscopy images. Here, a study of intravalley and intervalley double-resonance Raman processes mediated by static potentials in rotationally stacked bilayer graphene is presented. The peak properties depend on the mismatch rotation angle and can be used as an optical signature for superlattices in bilayer graphene. An atomic force microscopy system is used to produce and identify specific rotationally stacked bilayer graphenes that demonstrate the validity of our model.
authors: Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-972, Brazil.
authors: Victor
authors: V
authors: Carozo
authors: Clara M
authors: CM
authors: Almeida
authors: Erlon H M
authors: EH
authors: Ferreira
authors: Luiz Gustavo
authors: LG
authors: Cançado
authors: Carlos Alberto
authors: CA
authors: Achete
authors: Ado
authors: A
authors: Jorio
mesh_terms: D003198:Computer Simulation; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D006108:Graphite