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Raman spectroscopy in graphene
Malard, L.M. ; Pimenta, M.A. ; Dresselhaus, G. ; Dresselhaus, M.S.
Physics reports, 2009-04, Vol.473 (5), p.51-87
[Periódico revisado por pares]
Kidlington: Elsevier B.V
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Título:
Raman spectroscopy in graphene
Autor:
Malard, L.M.
;
Pimenta, M.A.
;
Dresselhaus, G.
;
Dresselhaus, M.S.
Assuntos:
Exact sciences and technology
;
Physics
É parte de:
Physics reports, 2009-04, Vol.473 (5), p.51-87
Descrição:
Recent Raman scattering studies in different types of graphene samples are reviewed here. We first discuss the first-order and the double resonance Raman scattering mechanisms in graphene, which give rise to the most prominent Raman features. The determination of the number of layers in few-layer graphene is discussed, giving special emphasis to the possibility of using Raman spectroscopy to distinguish a monolayer from few-layer graphene stacked in the Bernal (AB) configuration. Different types of graphene samples produced both by exfoliation and using epitaxial methods are described and their Raman spectra are compared with those of 3D crystalline graphite and turbostratic graphite, in which the layers are stacked with rotational disorder. We show that Resonance Raman studies, where the energy of the excitation laser line can be tuned continuously, can be used to probe electrons and phonons near the Dirac point of graphene and, in particular allowing a determination to be made of the tight-binding parameters for bilayer graphene. The special process of electron–phonon interaction that renormalizes the phonon energy giving rise to the Kohn anomaly is discussed, and is illustrated by gated experiments where the position of the Fermi level can be changed experimentally. Finally, we discuss the ability of distinguishing armchair and zig-zag edges by Raman spectroscopy and studies in graphene nanoribbons in which the Raman signal is enhanced due to resonance with singularities in the density of electronic states.
Editor:
Kidlington: Elsevier B.V
Idioma:
Inglês
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