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Sublattice localized electronic states in atomically resolved graphene-Pt(111) edge-boundaries

AuthorsMerino-Mateo, Pablo ; Rodrigo, L.; Pinardi, Anna Lisa ; Méndez, Javier ; López, María Francisca ; Pou, P.; Pérez, Rubén; Martín-Gago, José A.
Issue DateAug-2014
CitationFuerzas y Túnel (2014)
AbstractUnderstanding the connection of graphene with metal surfaces is a necessary step for developing atomically-precise graphene-based technology. In this work we combine high resolution RT-STM experiments with DFT calculations and non-equilibrium Green's functions method to unveil the atomic structure of a border-like edge between a Pt(111) step and a graphene zigzag edge. We have managed to get atomic resolution not only on both the metal and the graphene but also on the boundary (see Fig. 1). The graphene edges minimize their strain by inducing a 3-fold edge-reconstruction on the metal side. The tendency to form passivated zigzag graphene terminations plays a relevant role in the formation and orientation of the stable Moiré patterns. Our combined approach reveals the interesting electronic properties of this nanoscopic system including the preservation of the G-edge state shifted to energies at about +0.8 eV above Fermi level, highly localized in one of the graphene sublattices and confined to the G-Pt interface. This state spreads out inside the first Pt row resulting in a high quality G-metal electric contact that could be relevant for designing future atomically precise graphene metal leads.
DescriptionTrabajo presentado en la conferencia Fuerzas y Túnel (FyT2014), celebrada en San Sebastián del 27 al 29 de agosto de 2014.
Appears in Collections:(ICMM) Comunicaciones congresos
(CAB) Comunicaciones congresos
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