期刊
PHYSICAL REVIEW B
卷 88, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.125425
关键词
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资金
- European Research Council [208344]
- Danish Council for Independent Research, Natural Sciences
- Danish Council for Independent Research, Technology and Production Sciences under G-MOL
- Danish Council for Strategic Research, Technology and Production Sciences, under DA-GATE
- Danish National Advanced Technology Foundation under NIAGRA
- VILLUM foundation
- Lundbeck Foundation
- European Research Council (ERC) [208344] Funding Source: European Research Council (ERC)
We probe the structure and electronic band structure of graphene grown on a Pt(100) substrate using scanning tunneling microscopy, low energy electron diffraction, and angle-resolved photoemission spectroscopy. It is found that the graphene layer lacks a well-defined azimuthal orientation with respect to the substrate, causing a circular smearing of the p band instead of a well-defined Dirac cone near the Fermi level. The graphene is found to be electron doped placing the Dirac point similar to 0.45 eV below the Fermi level, and a gap of 0.15 +/- 0.03 eV is found at the Dirac point. We dose atomic hydrogen and monitor the coverage on the graphene by analyzing the impurity-induced broadening of the pi-band width. Saturation of graphene on Pt(100) with hydrogen does not expand the band gap, but instead hydrogen-mediated broadening and rehybridization of the graphene sp(2) bonds into sp(3) leads to a complete disruption of the graphene pi band, induces a lifting of the Pt(100) reconstruction, and introduces a dispersing Pt state near the Fermi level. Deposition of rubidium on graphene on Pt(100) leads to further electron doping, pushing the Dirac point to a binding energy of similar to 1.35 eV, and increasing the band gap to 0.65 +/- 0.04 eV.
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