Abstrakt
The micro-Raman-scattering response of a graphenelike location on the surface of bulk natural graphite is investigated both at T = 4.2K and at room temperature in magnetic fields up to 29 T. Two different polarization configurations, cocircular and crossed circular, are employed in order to determine the Raman-scattering selection rules.
Several distinct series of electronic excitations are observed, and we discuss their characteristic shapes and amplitudes. In particular, we report a clear splitting of the signals associated with the inter-Landau-level excitations -n -> +n.
Furthermore, we observe the pronounced interaction of the zone-center E-2g phonon with three different sets of electronic excitations. Possible origins for these graphenelike inclusions on the surface of bulk graphite are discussed.