Cyclotron resonance in bilayer graphene

Details Cyclotron resonance in bilayer graphene Cyclotron resonance in bilayer graphene

2008-01-11

arxiv.org/abs/0801.1861v2

Phys. Rev. Lett. 100, 087403 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Phys. Rev. Lett. Updated version with two added references and minor text editing

Scientific paper

10.1103/PhysRevLett.100.087403

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.

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