Direct evidence for a metallic interlayer band in Rb-intercalated bilayer graphene

J. Kleeman, Katsuaki Sugawara, Takafumi Sato, Takashi Takahashi

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16 Citations (Scopus)

Abstract

We have fabricated Rb-intercalated bilayer graphene on 6H-SiC(0001) and performed low-energy electron diffraction (LEED) and high-resolution angle-resolved photoemission spectroscopy (ARPES). In LEED experiments, we observed a 2 × 2 pattern identical to that of the bulk graphite intercalation compound C8Rb. The existence of a 2 × 2 Rb layer is also confirmed by ARPES, where band folding due to the periodic potential of intercalated atoms was observed. All these results indicate that Rb atoms are intercalated between the two graphene monolayers in a regular manner similar to that of bulk C8Rb. Further, we observed a parabolic metallic band at the Brillouin-zone center, analogous to the so-called interlayer band, which is thought to play an important role for the superconductivity in graphite intercalation compounds.

Original languageEnglish
Article number195401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number19
DOIs
Publication statusPublished - 2013 May 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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