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Robustness of the optical conductivity sum rule in bilayer graphene (Articolo in rivista)

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Robustness of the optical conductivity sum rule in bilayer graphene (Articolo in rivista) (literal)

Anno

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Alternative label

L. Benfatto (1,2); S.G. Sharapov (3,4); J.P. Carbotte (4) (2008)
Robustness of the optical conductivity sum rule in bilayer graphene
in Physical review. B, Condensed matter and materials physics
(literal)

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(1) Centro Studi e Ricerche \"Enrico Fermi,\" via Panisperna 89/A, I-00184 Rome, Italy (2) CNR-SMC-INFM and Department of Physics, University of Rome \"La Sapienza\", Piazza le Aldo Moro 5, I-00185 Rome, Italy (3) Department of Physics, Western Illinois University, Macomb, Illinois 61455, USA (4) Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1 (literal)

Titolo

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. (literal)

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