Electronic structure of the Au-intercalated graphene/Ni(111) surface |
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Authors: | Youngsin Park Daesung Jung Han-Na Hwang Chan-Cuk Hwang |
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Institution: | 1. School of Natural Science, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea;2. Beamline Research Division, Pohang Accelerator Laboratory, Pohang, 37673, South Korea |
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Abstract: | We report the electronic structure of the Au-intercalated graphene/Ni(111) surface using angle-resolved photoemission spectroscopy and low energy electron diffraction. The graphene/Ni(111) shows no Dirac cone near the Fermi level and a relatively broad C 1s core level spectrum probably due to the broken sublattice symmetry in the graphene on the Ni(111) substrate. When Au atoms are intercalated between them, the characteristic Dirac cone is completely recovered near the Fermi level and the C 1s spectrum becomes sharper with the appearance of a 10?×?10 superstructure. The fully Au-intercalated graphene/Ni(111) surface shows a p-type character with a hole pocket of ~0.034?Å?1 diameter at the Fermi level. When the surface is doped with Na and K, a clear energy gap of ~0.4?eV is visible irrespective of alkali metal. |
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Keywords: | Graphene Ni(111) Au intercalation Angle-resolved photoemission spectroscopy Spin-orbit coupling Band gap opening |
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