Long range Coulomb interaction in bilayer graphene

Details Long range Coulomb interaction in bilayer graphene Long range Coulomb interaction in bilayer graphene

2008-11-04

arxiv.org/abs/0811.0574v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, RevTeX

Scientific paper

10.1103/PhysRevLett.102.056807

We report on our studies of interacting electrons in bilayer graphene in a magnetic field. We demonstrate that the long range Coulomb interactions between electrons in this material are highly important and account for the band asymmetry in recent optical magneto-absorption experiments. We show that in the unbiased bilayer (where both layers are at the same electrostatic potential), the interactions can cause mixing of Landau levels in moderate magnetic fields. For the biased bilayer (when the two layers are at different potentials), we demonstrate that the interactions are responsible for a change in the total spin of the ground state for half-filled Landau levels in the valence band.

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