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Electronic structure of the Au-intercalated graphene/Ni(111) surface
박영신,정대성,황한나,황찬국 한국물리학회 2019 Current Applied Physics Vol.19 No.3
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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