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

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 $\mathrm{Pt}(997)$ surface. The measurements show the predominance of a ($2\ifmmode\times\else\texttimes\fi{}2$) multidomain superstructure of graphene, lying flat on the Pt terraces and covering the step edges in a carpetlike mode. The linearly dispersing $\ensuremath{\pi}$ band of graphene appears to be weakly affected by the substrate at the $K$ point, while an appreciable hybridization is found at the $\ensuremath{\Gamma}$ point. Replicas of the Dirac cone are seen perpendicularly to the steps, with double real-space periodicity compared to the Pt terrace width.