2012/10/05 by Jens Christian Johannsen, J. Johannsen, Søren Ulstrup +10 · 36 citations
Chemistry · Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Chemical physics #Chemistry #Condensed matter physics #Coupling (piping) #Electron #Free electron model #Graphene #Graphene research and applications #Materials science #Nanotechnology #Phonon #Physics #Quantum and electron transport phenomena #Quantum mechanics #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/25/9/094001
published in Journal of Physics Condensed Matter 25(9), 094001 (IOP Publishing) · 5 pages, 3 figures
arxiv created 2012/10/05 · openalex publication_date 2013/02/12 · arxiv updated 2015/06/11 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
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.