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Electron localization in epitaxial graphene on Ru(0001) determined by moiré corrugation
- 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.
- Subjects :
- Materials science
Condensed matter physics
Graphene
Fermi level
Electronic structure
Química
Condensed Matter Physics
Spectral line
Electron localization function
Electronic, Optical and Magnetic Materials
law.invention
symbols.namesake
law
symbols
Density functional theory
van der Waals force
Scanning tunneling microscope
Subjects
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