Exciton formation in graphene bilayer

Details Exciton formation in graphene bilayer Exciton formation in graphene bilayer

2007-09-08

arxiv.org/abs/0709.1230v2

Phys. Rev. B 78, 045401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 11 figures

Scientific paper

10.1103/PhysRevB.78.045401

Exciton instability in graphene bilayer systems is studied in the case of a short-ranged Coulomb interaction and a finite voltage difference between the layers. Self-consistent exciton gap equations are derived and solved numerically and analytically under controlled approximation. We obtain that a critical strength of the Coulomb interaction exists for the formation of excitons. The critical strength depends on the amount of voltage difference between the layers and on the inter-layer hopping parameter.

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