Quasi-freestanding graphene on Ni(110): A graphene/metal contact with suppressed interface states
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Graphene/Ni(110) has been studied by time-resolved X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure. The C 1s core level shows a splitting typical of periodically rippled interfaces. The analysis of the C K-edge reveals that the interface states previously observed for graphene/Ni(111) are suppressed in graphene/Ni(110). This suppression is due to the reduced hybridization of the Dirac-cone electrons in graphene with the d-bands of the (110)-oriented nickel contacts. Our results show that, contrary to commensurate growth of graphene on Ni(111), epitaxially grown graphene on Ni(110) behaves as a quasi-freestanding sheet, as the lattice mismatch gives rise to a moiré reconstruction.
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Quasi-freestanding graphene on Ni(110): A graphene/metal contact with suppressed interface states
Abstract
Graphene/Ni(110) has been studied by time-resolved X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure. The C 1s core level shows a splitting typical of periodically rippled interfaces. The analysis of the C K-edge reveals that the interface states previously observed for graphene/Ni(111) are suppressed in graphene/Ni(110). This suppression is due to the reduced hybridization of the Dirac-cone electrons in graphene with the d-bands of the (110)-oriented nickel contacts. Our results show that, contrary to commensurate growth of graphene on Ni(111), epitaxially grown graphene on Ni(110) behaves as a quasi-freestanding sheet, as the lattice mismatch gives rise to a moiré reconstruction.
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Acknowledgements
The author thank Elettra-Sincrotrone Trieste S.C.p.A. for financial support. Silvano Lizzit and Paolo Lacovig are also acknowledged for support during the beamtime at the SuperESCA beamline. The author also thanks Anna Cupolillo for helpful discussions. Gennaro Chiarello is acknowledged for helpful discussions and for having provided the sample.
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