Electronic structure and imaging contrast of graphene moiré on metals

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2013
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Voloshina, Elena N.
Fertitta, Edoardo
Garhofer, Andreas
Mittendorfer, Florian
Thissen, Andreas
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Scientific Reports. 2013, 3, 1072. eISSN 2045-2322. Available under: doi: 10.1038/srep01072
Zusammenfassung

Realization of graphene moiré superstructures on the surface of 4d and 5d transition metals offers templates with periodically modulated electron density, which is responsible for a number of fascinating effects, including the formation of quantum dots and the site selective adsorption of organic molecules or metal clusters on graphene. Here, applying the combination of scanning probe microscopy/spectroscopy and the density functional theory calculations, we gain a profound insight into the electronic and topographic contributions to the imaging contrast of the epitaxial graphene/Ir(111) system. We show directly that in STM imaging the electronic contribution is prevailing compared to the topographic one. In the force microscopy and spectroscopy experiments we observe a variation of the interaction strength between the tip and high-symmetry places within the graphene moiré supercell, which determine the adsorption sites for molecules or metal clusters on graphene/Ir(111).

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ISO 690VOLOSHINA, Elena N., Edoardo FERTITTA, Andreas GARHOFER, Florian MITTENDORFER, Mikhail FONIN, Andreas THISSEN, Yuriy S. DEDKOV, 2013. Electronic structure and imaging contrast of graphene moiré on metals. In: Scientific Reports. 2013, 3, 1072. eISSN 2045-2322. Available under: doi: 10.1038/srep01072
BibTex
@article{Voloshina2013Elect-22154,
  year={2013},
  doi={10.1038/srep01072},
  title={Electronic structure and imaging contrast of graphene moiré on metals},
  volume={3},
  journal={Scientific Reports},
  author={Voloshina, Elena N. and Fertitta, Edoardo and Garhofer, Andreas and Mittendorfer, Florian and Fonin, Mikhail and Thissen, Andreas and Dedkov, Yuriy S.},
  note={Article Number: 1072}
}
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