Ultrafast charge transfer at monolayer graphene surfaces with varied substrate coupling (Articolo in rivista)

Type
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  • Ultrafast charge transfer at monolayer graphene surfaces with varied substrate coupling (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/nn4008862 (literal)
Alternative label
  • Silvano Lizzit, Rosanna Larciprete, Paolo Lacovig, Krassimir L. Kostov, Dietrich Menzel (2013)
    Ultrafast charge transfer at monolayer graphene surfaces with varied substrate coupling
    in ACS nano
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Silvano Lizzit, Rosanna Larciprete, Paolo Lacovig, Krassimir L. Kostov, Dietrich Menzel (literal)
Pagina inizio
  • 4359 (literal)
Pagina fine
  • 4366 (literal)
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  • http://pubs.acs.org/doi/abs/10.1021/nn4008862 (literal)
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  • 7 (literal)
Rivista
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  • 8 (literal)
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  • 5 (literal)
Note
  • Scopu (literal)
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  • Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, 34149 Trieste, Italy CNR-Institute for Complex Systems, Via Fosso del Cavaliere 100, 00133 Roma, Italy Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria Physik-Department E20, Technische Universität München, 85748 Garching, Germany, and Fritz-Haber-Institut der MPG, Department CP, 14195 Berlin, Germany (literal)
Titolo
  • Ultrafast charge transfer at monolayer graphene surfaces with varied substrate coupling (literal)
Abstract
  • The charge transfer rates of a localized excited electron to graphene monolayers with variable substrate coupling have been investigated by the core hole clock method with adsorbed argon. Expressed as charge transfer times, we find strong variations between ?3 fs (on graphene \"valleys\" on Ru(0001)) to ?16 fs (quasi-free graphene on SiC, O/Ru(0001), or SiO 2/Ru). The values for the \"hills\" on Gr/Ru and on Gr/Pt(111) are in between, with the ratio 1.7 between the charge transfer times measured on \"hills\" and \"valleys\" of Gr/Ru. We discuss the results for Gr on metals in terms of hybridized Ru-C orbitals, which change with the relative Gr-Ru alignment and distance. The charge transfer on the decoupled graphene layers must represent the intrinsic coupling to the graphene empty ?* states. Its low rate may be influenced by processes retarding the spreading of charge after transfer. (literal)
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