Exciton formation in graphene bilayer
| Autor: | Dillenschneider, Raoul, Han, Jung Hoon |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 78, 045401 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.78.045401 |
| Popis: | 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. Comment: 10 pages, 11 figures |
| Databáze: | arXiv |
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