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Philip Hofmann

Electron-phonon coupling in quasi free-standing graphene

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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 is 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. Both systems show a similar overall behaviour of the self-energy and a weak renormalization of the bands near the Fermi energy. The electron-phonon coupling is found to be sufficiently weak to make the precise determination of the coupling constant lambda through renormalization difficult. The estimated value of lambda is 0.05(3) for both systems.
OriginalsprogEngelsk
TidsskriftJournal of Physics: Condensed Matter
Vol/bind25
Sider (fra-til)094001
Antal sider5
ISSN0953-8984
DOI
StatusUdgivet - 12 feb. 2013

    Forskningsområder

  • cond-mat.str-el, cond-mat.mtrl-sci

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