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Electron Configurations02:46

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Empty electron states in cobalt-intercalated graphene.

Alberto Calloni1, Gianlorenzo Bussetti1, Giulia Avvisati2

  • 1Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano, Italy.

The Journal of Chemical Physics
|December 9, 2020
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This summary is machine-generated.

Cobalt intercalation into epitaxial graphene on iridium modifies electronic states by mixing graphene π* bands with cobalt d states. This interaction shifts the graphene Dirac cone and alters surface image potential states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Epitaxial graphene's electronic properties are sensitive to substrate interactions.
  • Understanding these interactions is key for designing novel electronic devices.

Purpose of the Study:

  • To investigate the impact of cobalt intercalation on the electronic structure of graphene grown on iridium.
  • To characterize the changes in empty electron states and surface properties.

Main Methods:

  • Angle-resolved inverse photoemission spectroscopy (ARIPES)
  • X-ray absorption spectroscopy (XAS)
  • Density functional theory (DFT) calculations

Main Results:

  • Weakly bonded graphene on iridium retains its characteristic band structure.
  • Cobalt intercalation leads to intermixing of graphene π* bands and cobalt d states.
  • A downward shift of the graphene Dirac cone and altered image potential states on iridium were observed.

Conclusions:

  • Cobalt intercalation significantly modifies the electronic landscape of graphene/Ir(111).
  • The observed changes offer insights into controlling electronic properties at interfaces for potential applications.