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Título

Graphene tunable transparency to tunneling electrons: A direct tool to measure the local coupling

AutorGonzález-Herrero, Héctor; Pou, Pablo; Lobo-Checa, Jorge CSIC ORCID ; Fernández-Torre, Delia; Craes, Fabian; Martínez-Galera, Antonio J.; Ugeda, Miguel M. CSIC ORCID CVN; Corso, Martina CSIC ORCID ; Ortega, J. Enrique CSIC ORCID; Gómez-Rodríguez, José M.; Pérez, Rubén; Brihuega, Iván
Fecha de publicación2016
EditorAmerican Chemical Society
CitaciónACS Nano 10(5): 5131–5144 (2016)
ResumenThe local interaction between graphene and a host substrate strongly determines the actual properties of the graphene layer. Here we show that scanning tunneling microscopy (STM) can selectively help to visualize either the graphene layer or the substrate underneath, or even both at the same time, providing a comprehensive picture of this coupling with atomic precision and high energy resolution. We demonstrate this for graphene on Cu(111). Our spectroscopic data show that, in the vicinity of the Fermi level, graphene π bands are well preserved presenting a small n-doping induced by Cu(111) surface state electrons. Such results are corroborated by Angle-Resolved Photoemission Spectra (ARPES) and Density Functional Theory with van der Waals (DFT + vdW) calculations. Graphene tunable transparency also allows the investigation of the interaction between the substrate and foreign species (such as atomic H or C vacancies) on the graphene layer. Our calculations explain graphene tunable transparency in terms of the rather different decay lengths of the graphene Dirac π states and the metal surface state, suggesting that it should apply to a good number of graphene/substrate systems.
Versión del editorhttps://doi.org/10.1021/acsnano.6b00322
URIhttp://hdl.handle.net/10261/244659
DOI10.1021/acsnano.6b00322
ISSN1936-086X
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