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Periodically modulated geometric and electronic structure of graphene on Ru(0 0 0 1)

AuthorsBorca, B.; Barja, S.; Garnica, Manuela; Hinarejos, J. J.; Vázquez de Parga, A. L.; Miranda, Rodolfo CSIC; Guinea, F. CSIC ORCID
Issue Date3-Feb-2010
PublisherInstitute of Physics Publishing
CitationSemiconductor Science and Technology 25(3): 034001 (2010)
AbstractWe report here on a method of fabricating and characterizing highly perfect, periodically rippled graphene monolayers and islands, epitaxially grown on single crystal metallic substrates under controlled ultra-high vacuum conditions. The periodicity of the ripples is dictated by the difference in lattice parameters of graphene and substrate, and, thus, it is adjustable. We characterize its perfection at the atomic scale by means of STM and determine its electronic structure in the real space by local tunnelling spectroscopy. There are periodic variations in the geometric and electronic structure of the graphene monolayer. We observe inhomogeneities in the charge distribution, i.e. a larger occupied density of states at the higher parts of the ripples. Periodically rippled graphene might represent the physical realization of an ordered array of coupled graphene quantum dots. The data show, however, that for rippled graphene on Ru(0 0 0 1) both the low and the high parts of the ripples are metallic. The fabrication of periodically rippled graphene layers with controllable characteristic length and different bonding interactions with the substrate will allow a systematic experimental test of this fundamental problem. © 2010 IOP Publishing Ltd.
Publisher version (URL)https://doi.org/10.1088/0268-1242/25/3/034001
Identifiersdoi: 10.1088/0268-1242/25/3/034001
issn: 0268-1242
Appears in Collections:(ICMM) Artículos
(IMEDEA) Artículos
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