期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.056801
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资金
- Deutsche Forschungsgemeinschaft [GK 790]
- Ikerbasque foundation
The unoccupied electronic states of epitaxially grown graphene on Ru(0001) have been explored by time-and angle-resolved two-photon photoemission. We identify a Ru derived resonance and a Ru/graphene interface state at 0.91 and 2.58 eV above the Fermi level, as well as three image-potential derived states close to the vacuum level. The most strongly bound, short-lived, and least dispersing image-potential state is suggested to have some quantum-well character with a large amplitude below the graphene hills. The two other image-potential states are attributed to a series of slightly decoupled states. Their lifetimes and dispersions are indicative of electrons moving almost freely above the valley areas of the moire superstructure of graphene.
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