title: Electron-phonon coupling in quasi-free-standing graphene.
abstract: Quasi-free-standing monolayer graphene can be produced by intercalating species like oxygen or hydrogen between epitaxial graphene and the substrate crystal. If the graphene was indeed decoupled from the substrate, one would expect the observation of a similar electronic dispersion and many-body effects, irrespective of the substrate and the material used to achieve the decoupling. Here we investigate the electron-phonon coupling in two different types of quasi-free-standing monolayer graphene: decoupled from SiC via hydrogen intercalation and decoupled from Ir via oxygen intercalation. The two systems show similar overall behaviours of the self-energy and a weak renormalization of the bands near the Fermi energy. The electron-phonon coupling is found to be so weak that it renders the precise determination of the coupling constant λ through renormalization difficult. The estimated value of λ is 0.05(3) for both systems.
authors: Department of Physics and Astronomy, Interdisciplinary Nanoscience Centre, Aarhus University, DK-8000 Aarhus C, Denmark.
authors: Jens Christian
authors: JC
authors: Johannsen
authors: Søren
authors: S
authors: Ulstrup
authors: Marco
authors: M
authors: Bianchi
authors: Richard
authors: R
authors: Hatch
authors: Dandan
authors: D
authors: Guan
authors: Federico
authors: F
authors: Mazzola
authors: Liv
authors: L
authors: Hornekær
authors: Felix
authors: F
authors: Fromm
authors: Christian
authors: C
authors: Raidel
authors: Thomas
authors: T
authors: Seyller
authors: Philip
authors: P
authors: Hofmann