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26 April 2024

» arxiv » 1110.4522

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Simultaneous Observation of Electron and Hole Cyclotron Resonance in Graphene in the Magnetic Quantum Limit
L. G. Booshehri ; C. H. Mielke ; D. G. Rickel ; S. A. Crooker ; Q. Zhang ; L. Ren ; E. H. Haroz ; A. Rustagi ; C. J. Stanton ; Z. Jin ; Z. Sun ; Z. Yan ; J. M. Tour ; J. Kono ;
Date:	20 Oct 2011
Abstract:	Using ultrahigh magnetic fields up to 170 T and polarized midinfrared radiation with tunable wavelengths, we studied cyclotron resonance in large-area graphene. Circular polarization dependence reveals strong p-type doping for as-grown graphene, while wavelength dependence determines the Fermi energy. 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.
Source:	arXiv, 1110.4522
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