Signature of electronic excitations in the Raman spectrum of graphene

Kashuba, Oleksiy and Falko, Vladimir (2009) Signature of electronic excitations in the Raman spectrum of graphene. Physical review B, 80 (24): 241404. ISSN 1098-0121

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Abstract

Inelastic light scattering from Dirac-type electrons in graphene is shown to be dominated by the generation of the interband 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(-)-> n(+) inter-Landau-level modes with energies omega(n)=22nhv/lambda(B) and characteristically crossed polarization of in/out photons.