Back to Search Start Over

Electron localization in epitaxial graphene on Ru(0001) determined by moiré corrugation

Authors :
Bogdana Borca
Sara Barja
Daniele Stradi
Fernando Martín
Manuel Alcamí
Juan José Hinarejos
Andrés Arnau
Daniel Sánchez-Portal
Cristina Díaz
Manuela Garnica
Rodolfo Miranda
A. L. Vázquez de Parga
UAM. Departamento de Química
Comunidad de Madrid
Ministerio de Ciencia e Innovación (España)
Eusko Jaurlaritza
Universidad del País Vasco
Ministerio de Educación, Cultura y Deporte (España)
UAM. Departamento de Física de la Materia Condensada
Source :
Biblos-e Archivo. Repositorio Institucional de la UAM, instname, Digital.CSIC. Repositorio Institucional del CSIC, Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia
Publication Year :
2012
Publisher :
American Physical Society, 2012.

Abstract

The interpretation of scanning tunneling spectroscopy (STS) and scanning tunneling microscopy measurements of epitaxial graphene on lattice-mismatched substrates is a challenging problem, because of the spatial modulation in the electronic structure imposed by the formation of a moiré pattern. Here we describe the electronic structure of graphene adsorbed on Ru(0001) by means of density functional theory calculations that include van der Waals interactions and are performed on a large 11×11 unit cell to account for the observed moiré patterns. Our results show the existence of localized electronic states in the high and low areas of the moiré at energies close to and well above the Fermi level, respectively. Localization is due to the spatial modulation of the graphene-Ru(0001) interaction and is at the origin of the various peaks observed in STS spectra. © 2012 American Physical Society.<br />Work supported by the MICINN Projects No. FIS2010-15127, No. FIS2010-18847, No. CTQ2010- 17006, No. FIS-2010-19609-C09-00, No. ACI2008-0777, No. 2010C-07-25200, and No. CSD2007-00010, the CAM program NANOBIOMAGNET S2009/MAT1726, and the Gobierno Vasco-UPV/EHU Project No. IT-366-07. S.B. acknowledges financial support from MEC under FPU Grant No. AP-2007-00157.

Details

Database :
OpenAIRE
Journal :
Biblos-e Archivo. Repositorio Institucional de la UAM, instname, Digital.CSIC. Repositorio Institucional del CSIC, Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia
Accession number :
edsair.doi.dedup.....cde57aa502957b6612f08fb062d2538e