Signature of electronic excitations in the Raman spectrum of graphene

Abstract

Inelastic light scattering from Dirac-type electrons in graphene is shown to be dominated by the generation of the inter-band electronic modes which are odd in terms of time-inversion symmetry and belong to the irreducible representation A${}_2$ of the point group C${}_{6v}$ of the honeycomb crystal. At high magnetic fields, these electron-hole excitations appear as peculiar $n^{-}\to n^{+}$ inter-Landau-level modes with energies ${\omega }_n=2\sqrt{2n}\hslash v/{\lambda }_B$ and characteristically crossed polarisation of in/out photons.

4 pages, 2 figures, revised and improved

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• Role of electronic excitations in magneto-Raman spectra of graphene
• Raman scattering of graphene based systems in high magnetic fields
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• Electronic Raman Scattering in Twistronic Few-Layer Graphene
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