Finding the bare band: Electron coupling to two phonon modes in potassium-doped graphene on Ir(111)

Abstract

We analyze renormalization of the pi band of n-doped epitaxial graphene on Ir(111) induced by electron-phonon coupling. Our procedure of extracting the bare band relies on recursive self-consistent refining of the functional form of the bare-band until the convergence. We demonstrate that the components of the self-energy, as well as the spectral intensity obtained from angle-resolved photoelectron spectroscopy (ARPES) show that the renormalization is due to the coupling to two distinct phonon excitations. From the velocity renormalization and an increase of the imaginary part of the self-energy we find the electron-phonon coupling constant to be ~0.2, which is in fair agreement with a previous study of the same system, despite the notable difference in the width of spectroscopic curves. Our experimental results also suggest that potassium intercalated between graphene and Ir(111) does not introduce any additional increase of the quasiparticle scattering rate.

accepted for publication in Phys. Rev. B

References in corpus (17)

• The electronic properties of graphene
• Doping graphene with metal contacts
• Dirac Cones and Minigaps for Graphene on Ir(111)
• Seeing many-body effects in single- and few-layer graphene: Observation of two-dimensional saddle-point excitons
• Many-body interactions in quasi-freestanding graphene
• Electron-phonon coupling and electron self-energy in electron-doped graphene: calculation of angular resolved photoemission spectra
• Electron-Phonon Interactions in Graphene, Bilayer Graphene, and Graphite
• Self-consistent self-energy analysis of photoemission data
• Bare electron dispersion from photoemission experiments
• Illuminating the dark corridor in graphene: polarization dependence of angle-resolved photoemission spectroscopy on graphene
• Graphene on Ir(111) characterized by angle-resolved photoemission
• Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
• Electronic structure of superconducting KC${}_8$ and non-superconducting LiC${}_6$ graphite intercalation compounds: Evidence for a graphene-sheet-driven superconducting state
• Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene
• Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene
• A reevaluation of the coupling to a bosonic mode of the charge carriers in (Bi,Pb)${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ at the antinodal point
• A spectral function tour of electron-phonon coupling outside the Migdal limit

Cited by in corpus (18)

• The mechanism of caesium intercalation of graphene
• Overdoping graphene beyond the van Hove singularity
• Electronic structure, imaging contrast and chemical reactivity of graphene moiré on metals
• Damping effects in hole-doped graphene: the relaxation-time approximation
• Electron-phonon coupling in quasi free-standing graphene
• Strong electron-phonon coupling in the sigma band of graphene
• Accessing the spectral function of in operando devices by angle-resolved photoemission spectroscopy
• Phonon-mediated superconductivity in doped monolayer materials
• Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
• Electron-magnon coupling and quasiparticle lifetimes on the surface of a topological insulator
• Surface charge-transfer doping a quantum-confined silver monolayer beneath epitaxial graphene
• Spectroscopic investigations of phonons in epitaxial graphene
• Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling
• Electronic Structure and Kohn-Luttinger Superconductivity of Heavily-Doped Single-Layer Graphene
• Phonon-Mediated Quasiparticle Lifetime Renormalizations in Few-Layer Hexagonal Boron Nitride
• Effective numbers of charge carriers in doped graphene: The generalized Fermi liquid approach
• Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet
• High Crystallinity and Decoupling of Graphene on a Metal: Reduced Coulomb Screening and Tunable pn-Junctions