Universität zu Köln

Gonzalez-Herrero, Hector, Pou, Pablo ORCID: 0000-0002-5854-8218, Lobo-Checa, Jorge ORCID: 0000-0003-2698-2543, Fernandez-Torre, Delia, Craes, Fabian, Martinez-Galera, Antonio J., Ugeda, Miguel M., Corso, Martina ORCID: 0000-0002-8592-1284, Enrique Ortega, J., Gomez-Rodriguez, Jose M., Perez, Ruben ORCID: 0000-0001-5896-541X and Brihuega, Ivan ORCID: 0000-0001-5032-9304 (2016). Graphene Tunable Transparency to Tunneling Electrons: A Direct Tool To Measure the Local Coupling. ACS Nano, 10 (5). S. 5131 - 5145. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-086X

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Abstract

The 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 pi 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 pi states and the metal surface state, suggesting that it should apply to a good number of graphene/substrate systems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gonzalez-Herrero, Hector UNSPECIFIED UNSPECIFIED UNSPECIFIED Pou, Pablo UNSPECIFIED orcid.org/0000-0002-5854-8218 UNSPECIFIED Lobo-Checa, Jorge UNSPECIFIED orcid.org/0000-0003-2698-2543 UNSPECIFIED Fernandez-Torre, Delia UNSPECIFIED UNSPECIFIED UNSPECIFIED Craes, Fabian UNSPECIFIED UNSPECIFIED UNSPECIFIED Martinez-Galera, Antonio J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ugeda, Miguel M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Corso, Martina UNSPECIFIED orcid.org/0000-0002-8592-1284 UNSPECIFIED Enrique Ortega, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gomez-Rodriguez, Jose M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perez, Ruben UNSPECIFIED orcid.org/0000-0001-5896-541X UNSPECIFIED Brihuega, Ivan UNSPECIFIED orcid.org/0000-0001-5032-9304 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-277470
DOI:	10.1021/acsnano.6b00322
Journal or Publication Title:	ACS Nano
Volume:	10
Number:	5
Page Range:	S. 5131 - 5145
Date:	2016
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1936-086X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EPITAXIAL GRAPHENE; DISPERSION; CONFINEMENT; CU(111); ORIGIN; GROWTH; FILMS Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27747