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Raman scattering study of the phonon dispersion in twisted bilayer graphene
Ist Teil von
Nano research, 2013-04, Vol.6 (4), p.269-274
Ort / Verlag
Heidelberg: Tsinghua Press
Erscheinungsjahr
2013
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Bilayer graphene with a twist angle O between the layers generates a superlattice structure known as a Moir6 pattern. This superlattice provides a O-dependent q wavevector that activates phonons in the interior of the Brillouin zone. Here we show that this superlattice-induced Raman scattering can be used to probe the phonon dispersion in twisted bilayer graphene (tBLG). The effect reported here is different from the widely studied double-resonance in graphene-related materials in many aspects, and despite the absence of stacking order in tBLG, layer breathing vibrations (namely ZO' phonons) are observed.