title: Raman 2D-band splitting in graphene: theory and experiment.
abstract: We present a systematic experimental and theoretical study of the two-phonon (2D) Raman scattering in graphene under uniaxial tension. The external perturbation unveils that the 2D mode excited with 785 nm has a complex line-shape mainly due to the contribution of two distinct double resonance scattering processes (inner and outer) in the Raman signal. The splitting depends on the direction of the applied strain and the polarization of the incident light. The results give new insight into the nature of the 2D band and have significant implications for the use of graphene as reinforcement in composites since the 2D mode is crucial to assess how effectively graphene uptakes an applied stress or strain.
authors.affiliation: Institute of Chemical Engineering and High Temperature Chemical Processes, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), 265 04 Patras, Greece.
authors.forename: Otakar
authors.initials: O
authors.lastname: Frank
authors.forename: Marcel
authors.initials: M
authors.lastname: Mohr
authors.forename: Janina
authors.initials: J
authors.lastname: Maultzsch
authors.forename: Christian
authors.initials: C
authors.lastname: Thomsen
authors.forename: Ibtsam
authors.initials: I
authors.lastname: Riaz
authors.forename: Rashid
authors.initials: R
authors.lastname: Jalil
authors.forename: Kostya S
authors.initials: KS
authors.lastname: Novoselov
authors.forename: Georgia
authors.initials: G
authors.lastname: Tsoukleri
authors.forename: John
authors.initials: J
authors.lastname: Parthenios
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Papagelis
authors.forename: Ladislav
authors.initials: L
authors.lastname: Kavan
authors.forename: Costas
authors.initials: C
authors.lastname: Galiotis
mesh_terms: D003198:Computer Simulation; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D006108:Graphite