title: Dielectric response of pentagonal defects in multilayer graphene nano-cones.
abstract: The dielectric response of pentagonal defects in multilayer graphene nano-cones has been studied by electron energy loss spectroscopy and ab initio simulations. At the cone apex, a strong modification of the dielectric response is observed below the energy of the π plasmon resonance. This is attributed to π → π* interband transitions induced by topology-specific resonant π bonding states as well as π*-σ* hybridization. It is concluded that pentagonal defects strongly affect the local electronic structure in such a way that multi-walled graphene nano-cones should show great promise as field emitters.
authors.affiliation: SuperSTEM Laboratory, SciTech Daresbury, Keckwick Lane, Daresbury, WA4 4AD, UK. fshage@superstem.org qmramasse@superstem.org.
authors.forename: F S
authors.initials: FS
authors.lastname: Hage
authors.forename: D M
authors.initials: DM
authors.lastname: Kepaptsoglou
authors.forename: C R
authors.initials: CR
authors.lastname: Seabourne
authors.forename: Q M
authors.initials: QM
authors.lastname: Ramasse
authors.forename: A J
authors.initials: AJ
authors.lastname: Scott
authors.forename: Ø
authors.initials: Ø
authors.lastname: Prytz
authors.forename: A E
authors.initials: AE
authors.lastname: Gunnæs
authors.forename: G
authors.initials: G
authors.lastname: Helgesen