Angle-resolved photoemission spectroscopy, low-energy electron diffraction, and density functional theory calculations were employed to investigate the electronic and structural properties of a graphene layer grown on the regularly stepped Pt(997) surface. The measurements show the predominance of a (2×2) multidomain superstructure of graphene, lying flat on the Pt terraces and covering the step edges in a carpetlike mode. The linearly dispersing π band of graphene appears to be weakly affected by the substrate at the K point, while an appreciable hybridization is found at the Γ point. Replicas of the Dirac cone are seen perpendicularly to the steps, with double real-space periodicity compared to the Pt terrace width.

Electronic structure of epitaxial graphene grown on stepped Pt(997)

PACILE', Daniela;SINDONA, Antonio;Papagno M;
2014

Abstract

Angle-resolved photoemission spectroscopy, low-energy electron diffraction, and density functional theory calculations were employed to investigate the electronic and structural properties of a graphene layer grown on the regularly stepped Pt(997) surface. The measurements show the predominance of a (2×2) multidomain superstructure of graphene, lying flat on the Pt terraces and covering the step edges in a carpetlike mode. The linearly dispersing π band of graphene appears to be weakly affected by the substrate at the K point, while an appreciable hybridization is found at the Γ point. Replicas of the Dirac cone are seen perpendicularly to the steps, with double real-space periodicity compared to the Pt terrace width.
Angle-resolved photoemission spectroscopy; Density Functional Theory; Graphene on Metal Surfaces
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/138202
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