Exciton formation in graphene bilayer

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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.
10 pages, 11 figures

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Strongly Correlated Electrons, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/163967

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.1230
 http://arxiv.org/abs/0709.1230
 Phys. Rev. B 78, 045401 (2008)
 doi:10.1103/PhysRevB.78.045401

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arXiv