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Photoemission investigation of oxygen intercalated epitaxial graphene on Ru(0001)

Ulstrup, S.
•
Lacovig, P.
•
Orlando, F.
altro
Lizzit, S.
2018
  • journal article

Periodico
SURFACE SCIENCE
Abstract
We study the formation of epitaxial graphene on Ru(0001) using fast x-ray photoelectron spectroscopy during the growth process. The assignment of different C 1s and Ru 3d core level components and their evolution during the growth process gives a detailed insight into the graphene formation and the strongly varying graphene-Ru interaction strength within the large moiré unit cell. Subsequent intercalation of oxygen can be achieved at elevated temperature and the core level spectra show a conversion of the strongly corrugated to quasi free-standing graphene, characterised by a single narrow C 1s component. This conversion and the accompanying flattening of the graphene layer is also confirmed by x-ray photoelectron diffraction. The effect of oxygen intercalation on the electronic structure is studied using angle-resolved photoemission of the valence band states. For graphene/Ru(0001), the strong graphene-substrate hybridisation disrupts the π-band dispersion but oxygen intercalation fully restores the π-band with a strong p-doping that shifts the Dirac point 785 meV above the Fermi level. The doping of the system is highly tunable, as the additional exposure to rubidium can convert the carrier filling to n-type with the Dirac point 970 meV below the Fermi level.
DOI
10.1016/j.susc.2018.03.017
WOS
WOS:000454365200010
SCOPUS
2-s2.0-85045204502
Archivio
http://hdl.handle.net/11390/1191795
Diritti
open access
Soggetti
  • Angle-resolved photoe...

  • Doping

  • Epitaxial graphene

  • Intercalation

  • Photoelectron diffrac...

  • X-ray photoelectron s...

Web of Science© citazioni
11
Data di acquisizione
May 23, 2022
Scopus© citazioni
12
Data di acquisizione
Jun 7, 2022
Vedi dettagli
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