Author/Authors :
Papagno، نويسنده , , M. and Fraile Rodrيguez، نويسنده , , A. and Girit، نويسنده , , ا.ض. and Meyer، نويسنده , , J.C. and Zettl، نويسنده , , A. and Pacilé، نويسنده , , D.، نويسنده ,
Abstract :
We report the polarization-dependent C K photoabsorption spectra of single- and few-layer graphene (FLG) samples produced by micromechanical cleavage of highly ordered pyrolytic graphite (HOPG) on a SiO 2 substrate. We show that the unoccupied σ density of states of graphene and FLG strongly reflects the one measured on bulk HOPG, demonstrating the two-dimensional character of σ states as well as the very-weak interlayer couplings between planes. Moreover, our spectra taken with different polarization allow us to show the predicted hybrid nature of the interlayer state.
