Robustness of the optical-conductivity sum rule in Bilayer Graphene
arXiv:0712.1885 · doi:10.1103/PhysRevB.77.125422
Abstract
We calculate the optical sum associated with the in-plane conductivity of a graphene bilayer. A bilayer asymmetry gap generated in a field-effect device can split apart valence and conduction bands, which otherwise would meet at two K points in the Brillouin zone. In this way one can go from a compensated semimetal to a semiconductor with a tunable gap. However, the sum rule turns out to be 'protected' against the opening of this semiconducting gap, in contrast to the large variations observed in other systems where the gap is induced by strong correlation effects.
6 pages, 3 figures. Final version
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- Dirac electronic states in graphene systems: Optical spectroscopy studies
- Tunable Excitons in Biased Bilayer Graphene
- Magneto-optical Selection Rules in Bilayer Bernal Graphene
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- Disorder-induced tail states in a gapped bilayer graphene
- Universal absorption of two-dimensional systems