A micro-magneto-Raman scattering study of graphene on a bulk graphite substrate
1 LNCMI-CNRS (UJF, UPS, INSA) - BP 166, 38042 Grenoble Cedex 9, France
2 Institute of Experimental Physics, Faculty of Physics, University of Warsaw - Warsaw, Poland
Received: 28 July 2014
Accepted: 7 October 2014
We report on a magneto-Raman scattering study of graphene flakes located on the surface of a bulk graphite substrate. By spatially mapping the Raman scattering response of the surface of bulk graphite with an applied magnetic field, we pinpoint specific locations which show the electronic excitation spectrum of graphene. We present the characteristic Raman scattering signatures of these specific locations. We show that such flakes can be superimposed with another flake and still exhibit a graphene-like excitation spectrum. Two different excitation laser energies (514.5 and 720 nm) are used to investigate the excitation wavelength dependence of the electronic Raman scattering signal.
PACS: 73.22.Lp – Collective excitations / 63.20.kd – Phonon-electron interactions / 78.30.Na – Fullerenes and related materials
© EPLA, 2014