Journal article
Optical response and excitons in gapped graphene
Graphene can be rendered semiconducting via energy gaps introduced in a variety of ways, e.g., coupling to substrates, electrical biasing, or nanostructuring. To describe and compare different realizations of gapped graphene we propose a simple two-band model in which a "mass" term is responsible for the gap.
The optical conductivity predicted for this model is obtained as a simple closed-form expression. In addition, analytical estimates for the binding energy of excitons are derived and the impact of excitons on the optical response is analyzed.
Language: | English |
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Year: | 2009 |
ISSN: | 10953795 , 1550235x and 01631829 |
Types: | Journal article |
DOI: | 10.1103/PhysRevB.79.113406 |
ORCIDs: | Jauho, Antti-Pekka |