Decoupling and ordering of multilayer graphene on C-face3C-SiC(111)

We show experimentally that few layer graphene (FLG) grown on the carbon terminated surface(C-face) of 3C-SiC(111) is composed of decoupled graphene sheets. Landau levelspectroscopy onFLG graphene isperformed using the infrared optical Hall effect. We find that Landau level transitions in theFLG exhibit polarization preserving selection rules and the transition energiesobey a square-root dependence on the magnetic field strength. These results show that FLGon C-face 3C-SiC(111) behave effectively as a single layer graphene with linearlydispersing bands (Dirac cones) at the graphene K point. We estimate from the Landau levelspectroscopy anupper limit of the Fermi energy of about 60 meV in the FLG, which corresponds to a carrierdensity below 2.5 × 1011 cm−2. Low-energy electron diffractionμ-LEED) reveals the presence of azimuthally rotated graphene domains with a typicalsize of ≤200 nm. μ-LEED mapping suggests that the azimuth rotation occurs between adjacentdomains within the same sheet rather than vertically in the stack.