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Phys Rev Lett. 2008 Feb 29;100(8):087403. Epub 2008 Feb 27.

Cyclotron resonance in bilayer graphene.

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  • 1Department of Physics, Columbia University, New York, New York 10027, USA.


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 square root[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.

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