Optimizing long-range order, band gap, and group velocities for graphene on close-packed metal surfaces (Articolo in rivista)

Type
Label
  • Optimizing long-range order, band gap, and group velocities for graphene on close-packed metal surfaces (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-8984/24/31/314203 (literal)
Alternative label
  • F.D. Natterer, S. Rusponi, M. Papagno, C. Carbone, H. Brune (2012)
    Optimizing long-range order, band gap, and group velocities for graphene on close-packed metal surfaces
    in Journal of physics. Condensed matter (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F.D. Natterer, S. Rusponi, M. Papagno, C. Carbone, H. Brune (literal)
Pagina inizio
  • 314203 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 24 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 31 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Basovizza, Trieste, Italy (literal)
Titolo
  • Optimizing long-range order, band gap, and group velocities for graphene on close-packed metal surfaces (literal)
Abstract
  • We compare different growth methods with the aim of optimizing the long-range order of a graphene layer grown on Ru(0001). Combining chemical vapor deposition with carbon loading and segregation of the surface layer leads to autocorrelation lengths of 240 angstrom. We present several routes to band gap and charge carrier mobility engineering for the example of graphene on Ir(111). Ir cluster superlattices self-assembled onto the graphene moire pattern produce a strong renormalization of the electron group velocity close to the Dirac point, leading to highly anisotropic Dirac cones and the enlargement of the gap from 140 to 340 meV. This gap can further be enhanced to 740 meV by Na co-adsorption onto the Ir cluster superlattice at room temperature. This value is close to that of Ge, and the high group velocity of the charge carriers is fully preserved. We also present data for Na adsorbed without the Ir clusters. In both cases we find that the Na is on top of the graphene layer. (literal)
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