We report studies of cyclotron resonance in monolayer graphene. Cyclotron resonance is detected using the photoconductive response of the sample for several different Landau level occupancies. The experiments measure an electron velocity at the K- (Dirac) point of cK∗ = 1.093 x 106 ms−1 and in addition detect a significant asymmetry between the electron and hole bands, leading to a difference in the electron and hole velocities of 5% by energies of 125 meV away from the Dirac point.
@article{arxiv.0704.0410,
title = {Cyclotron Resonance study of the electron and hole velocity in graphene monolayers},
author = {R. S. Deacon and K-C. Chuang and R. J. Nicholas and K. S. Novoselov and A. K. Geim},
journal= {arXiv preprint arXiv:0704.0410},
year = {2007}
}