title: Raman fingerprint of aligned graphene/h-BN superlattices.
abstract: Graphene placed on hexagonal-boron nitride (h-BN) experiences a superlattice (Moiré) potential, which leads to a strong reconstruction of graphene's electronic spectrum with new Dirac points emerging at sub-eV energies. Here we study the effect of such superlattices on graphene's Raman spectrum. In particular, the 2D Raman peak is found to be exquisitely sensitive to the misalignment between graphene and h-BN lattices, probably due to the presence of a strain distribution with the same periodicity of the Moiré potential. This feature can be used to identify graphene superlattices with a misalignment angle smaller than 2°.
authors.affiliation: School of Chemistry and ‡School of Physics and Astronomy, University of Manchester , Manchester, United Kingdom.
authors.forename: Axel
authors.initials: A
authors.lastname: Eckmann
authors.forename: Jaesung
authors.initials: J
authors.lastname: Park
authors.forename: Huafeng
authors.initials: H
authors.lastname: Yang
authors.forename: Daniel
authors.initials: D
authors.lastname: Elias
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Mayorov
authors.forename: Geliang
authors.initials: G
authors.lastname: Yu
authors.forename: Rashid
authors.initials: R
authors.lastname: Jalil
authors.forename: Kostya S
authors.initials: KS
authors.lastname: Novoselov
authors.forename: Roman V
authors.initials: RV
authors.lastname: Gorbachev
authors.forename: Michele
authors.initials: M
authors.lastname: Lazzeri
authors.forename: Andre K
authors.initials: AK
authors.lastname: Geim
authors.forename: Cinzia
authors.initials: C
authors.lastname: Casiraghi