Separation-dependent electronic transparency of monolayer graphene membranes on III-V semiconductor substrates

Kevin T. He, Justin C. Koepke, Salvador Barraza-Lopez, Joseph W Lyding

Research output: Contribution to journalArticle

Abstract

Ultrahigh vacuum scanning tunneling microscopy and first-principles calculations have been carried out to study monolayer graphene nanomembranes deposited in situ onto UHV-cleaved GaAs(110) and InAs(110) surfaces. A bias-dependent semitransparency effect is observed in which the substrate atomic structure is clearly visible through the graphene monolayer. Statistical data analysis and density functional theory calculations suggest that this semitransparency phenomenon is due to the scanning tunneling microscope tip pushing the graphene membrane away from its equilibrium location and closer to the substrate surface, causing their electronic states to intermix.

Original languageEnglish (US)
Pages (from-to)3446-3452
Number of pages7
JournalNano letters
Volume10
Issue number9
DOIs
StatePublished - Sep 8 2010

Keywords

  • GaAs
  • Graphene
  • InAs
  • STM
  • density functional theory

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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