Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.036804
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Funding
- Spanish MICINN [FIS2007-61114, FIS2007-6671]
- Comunidad de Madrid [S-2009/MAT1726]
- Basque Government [IT-366-07]
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We explore the spatial variations of the unoccupied electronic states of graphene epitaxially grown on Ru(0001) and observed three unexpected features: the first graphene image state is split in energy; unlike all other image states, the split state does not follow the local work function modulation, and a new interfacial state at +3 eV appears on some areas of the surface. First-principles calculations explain the observations and permit us to conclude that the system behaves as a self-organized periodic array of quantum dots.
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