Electron-phonon coupling in the ordered phase of Rb on monolayer graphene

Woo Jong Shin, Sung Won Jung, Yeongsup Sohn, Sae Hee Ryu, Minjae Huh, Keun Su Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In the mechanism of two-dimensional (2D) superconductivity in doped graphene, it was predicted that the presence of dopant bands plays a key role. However, it has been challenging to fabricate an ordered phase of alkali metals on graphene owing to its van-der-Waals nature. We systematically study the phase formation of Rb on graphene epitaxially grown on H-passivated SiC(0001). We found a range of control parameters that stabilize the well-ordered 2 × 2 phase (RbC8), as confirmed by in-situ low-energy electron diffraction. Angle-resolved photoemission (ARPES) spectra taken from the 2 × 2 phase show a folded band of graphene and a parabolic band of Rb. In the vicinity of the Fermi level, the self-energy extracted from ARPES data reveals a clear signature of electronic coupling to the in-plane and out-of-plane phonon modes of C and Rb atoms. The electronic coupling of graphene to the in-plane vibration mode of Rb atoms is identified as a key factor for the enhancement of electron-phonon coupling.

Original languageEnglish
Pages (from-to)484-488
Number of pages5
JournalCurrent Applied Physics
Issue number4
Publication statusPublished - 2020 Apr

Bibliographical note

Publisher Copyright:
© 2020 Korean Physical Society

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Physics and Astronomy


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