Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-10-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 3 figures
Scientific paper
Using ultrahigh magnetic fields up to 170 T and polarized midinfrared radiation with tunable wavelengths from 9.22 to 10.67 um, we studied cyclotron resonance in large-area graphene grown by chemical vapor deposition. Circular-polarization dependent studies reveal strong p-type doping for as-grown graphene, and the dependence of the cyclotron resonance on radiation wavelength allows for a determination of the Fermi energy. Thermal annealing shifts the Fermi energy to near the Dirac point, resulting in the simultaneous appearance of hole and electron cyclotron resonance in the magnetic quantum limit, even though the sample is still p-type, due to graphene's linear dispersion and unique Landau level structure. These high-field studies therefore allow for a clear identification of cyclotron resonance features in large-area, low-mobility graphene samples.
Booshehri L. G.
Crooker Scott A.
Haroz E. H.
Jin Zhensheng
Kono Junichiro
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