Ytterbium-driven strong enhancement of electron-phonon coupling in graphene

Abstract

We present high-resolution angle-resolved photoemission spectroscopy study in conjunction with first principles calculations to investigate how the interaction of electrons with phonons in graphene is modified by the presence of Yb. We find that the transferred charges from Yb to the graphene layer hybridize with the graphene $\pi$ bands, leading to a strong enhancement of the electron-phonon interaction. Specifically, the electron-phonon coupling constant is increased by as much as a factor of 10 upon the introduction of Yb with respect to as grown graphene ($\le$0.05). The observed coupling constant constitutes the highest value ever measured for graphene and suggests that the hybridization between graphene and the adatoms might be a critical parameter in realizing superconducting graphene.

7 pages and 6 figures

References in corpus (14)

• Substrate-induced band gap opening in epitaxial graphene
• Controlling electron-phonon interactions in graphene at ultra high carrier densities
• Origins of anomalous electronic structures of epitaxial graphene on silicon carbide
• Tight--binding description of the quasiparticle dispersion of graphite and few--layer graphene
• Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction
• Electron-phonon coupling and electron self-energy in electron-doped graphene: calculation of angular resolved photoemission spectra
• Origin of the energy bandgap in epitaxial graphene
• Interplay of Coulomb and electron-phonon interactions in graphene
• Bare electron dispersion from photoemission experiments
• Self-consistent self-energy analysis of photoemission data
• Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
• Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene
• Electronic structure of heavily-doped graphene: the role of foreign atom states
• Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene