Cyclotron resonance in bilayer graphene
Abstract
We present the first measurements of cyclotron resonance of electrons and holes in bilayer graphene. In magnetic fields up to B = 18 T we observe four distinct intraband transitions in both the conduction and valence bands. The transition energies are roughly linear in B between the lowest Landau levels, whereas they follow \sqrt{B} for the higher transitions. This highly unusual behavior represents a change from a parabolic to a linear energy dispersion. The density of states derived from our data generally agrees with the existing lowest order tight binding calculation for bilayer graphene. However in comparing data to theory, a single set of fitting parameters fails to describe the experimental results.
Cite
@article{arxiv.0801.1861,
title = {Cyclotron resonance in bilayer graphene},
author = {E. A. Henriksen and Z. Jiang and L. -C. Tung and M. E. Schwartz and M. Takita and Y. -J. Wang and P. Kim and H. L. Stormer},
journal= {arXiv preprint arXiv:0801.1861},
year = {2008}
}
Comments
to appear in Phys. Rev. Lett. Updated version with two added references and minor text editing