Modification of electronic surface states by graphene islands on Cu(111)

Abstract

We present a study of graphene/substrate interactions on UHV-grown graphene islands with minimal surface contamination using \emph{in situ} low-temperature scanning tunneling microscopy (STM). We compare the physical and electronic structure of the sample surface with atomic spatial resolution on graphene islands versus regions of bare Cu(111) substrate. We find that the Rydberg-like series of image potential states is shifted toward lower energy over the graphene islands relative to Cu(111), indicating a decrease in the local work function, and the resonances have a much smaller linewidth, indicating reduced coupling to the bulk. In addition, we show the dispersion of the occupied Cu(111) Shockley surface state is influenced by the graphene layer, and both the band edge and effective mass are shifted relative to bare Cu(111).

arXiv comment12 pages, 3 figures

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Cited by in corpus (4)

• How to induce superconductivity in epitaxial graphene $via$ remote proximity effect through an intercalated gold layer
• Native defects in ultra-high vacuum grown graphene islands on Cu(111)
• Efficient n-type Doping in Epitaxial Graphene through Strong Lateral Orbital Hybridization of Ti Adsorbate
• Surface states and related quantum interference in \textit{ab initio} electron transport