Signature of electronic excitations in the Raman spectrum of graphene

Details Signature of electronic excitations in the Raman spectrum of graphene Signature of electronic excitations in the Raman spectrum of graphene

2009-06-29

arxiv.org/abs/0906.5251v4

Phys. Rev. B 80, 241404 (2009) - Published December 3, 2009

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, revised and improved

Scientific paper

10.1103/PhysRevB.80.241404

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 $\omega_n=2\sqrt{2n} \hbar v/\lambda_B$ and characteristically crossed polarisation of in/out photons.

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