Magneto-Raman scattering of graphene on graphite: Electronic and phonon excitations

Clément Faugeras (1) , Mario Amado (1) , Piotr Kossacki (1, 2) , Milan Orlita (1, 3) , Matthias Kühne (1) , Aurelien A. L. Nicolet (1) , Yu. I. Latyshev (4) , Marek Potemski (1)

1 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
2 IFD - Institute of Experimental Physics [Warsaw]
3 Institute of Physics
4 Institut de Génie Radiotechnique et Electronique V.A. Kotelnykova

Magneto-Raman scattering experiments from the surface of graphite reveal novel features associated to purely electronic excitations which are observed in addition to phonon-mediated resonances. Graphene-like and graphite domains are identified through experiments with $\sim 1\mu m$ spatial resolution performed in magnetic fields up to 32T. Polarization resolved measurements emphasize the characteristic selection rules for electronic transitions in graphene. Graphene on graphite displays the hybridization between optical phonon and symmetric across the Dirac point inter Landau level transitions. The results open new experimental possibilities - to use light scattering methods in studies of graphene under quantum Hall effect conditions.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Clément Faugeras, Mario Amado, Piotr Kossacki, Milan Orlita, Matthias Kühne, et al.. Magneto-Raman scattering of graphene on graphite: Electronic and phonon excitations. Physical Review Letters, 2011, 107, pp.036807. ⟨10.1103/PhysRevLett.107.036807⟩. ⟨hal-00557487⟩