We have measured the quantum Hall activation gaps in bilayer graphene at filling factors ν=±4 and ν=±8 in high magnetic fields up to 30 T. We find that energy levels can be described by a 4-band relativistic hyperbolic dispersion. The Landau level width is found to contain a field independent background due to an intrinsic level broadening and a component which increases linearly with magnetic field.
@article{arxiv.1009.5485,
title = {Quantum Hall activation gaps in bilayer graphene},
author = {E. V. Kurganova and A. J. M. Giesbers and R. V. Gorbachev and A. K. Geim and K. S. Novoselov and J. C. Maan and U. Zeitler},
journal= {arXiv preprint arXiv:1009.5485},
year = {2010}
}
Comments
4 pages, accepted version (just removed a few typos), will appear as Fast Track Communication in Solid State Commun