title: Observation of Localized Vibrational Modes of Graphene Nanodomes by Inelastic Atom Scattering.
abstract: Inelastic helium atom scattering (HAS) is suitable to determine low-energy (few meV) vibrations spatially localized on structures in the nanometer range. This is illustrated for the nanodomes that appear often on graphene (Gr) epitaxially grown on single crystal metal surfaces. The nature of the inelastic losses observed in Gr/Ru(0001) and Gr/Cu/Ru(0001) has been clarified by intercalation of Cu below the Gr monolayer, which decouples the Gr layer from the Ru substrate and changes substantially the out-of-plane, flexural phonon dispersion of epitaxial Gr, while maintaining the nanodomes and their localized vibrations. He diffraction proves that the Cu-intercalated Gr layer is well ordered structurally, while scanning tunneling microscopy reveals the persistence of the (slightly modified) periodic array of Gr nanodomes. A simple model explains the order of magnitude of the energy losses associated with the Gr nanodomes and their size dependence. The dispersionless, low-energy phonon branches may radically alter the transport of heat in intercalated Gr.
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Maccariello
authors.forename: A
authors.initials: A
authors.lastname: Al Taleb
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Calleja
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: A L
authors.initials: AL
authors.lastname: Vázquez de Parga
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Perna
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Camarero
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Gnecco
authors.forename: D
authors.initials: D
authors.lastname: Farías
authors.affiliation: Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Miranda
keywords: Graphene; STM; copper; helium atom scattering; phonons; ruthenium