Tunable excitons in gated graphene systems
| Autor: | Djotyan, Anahit P., Avetisyan, A. A., Moulopoulos, Konstantinos |
|---|---|
| Přispěvatelé: | Derbov V.L., Postnov D.E., Moulopoulos, Konstantinos [0000-0001-5139-436X] |
| Rok vydání: | 2017 |
| Předmět: |
Hamiltonians
bound excitonic states Electromagnetic field Computation theory Electric fields Materials science Coulomb correlations Band gap Exciton Static electric fields Excitonic absorption law.invention law Electric field Tight-binding approaches Integral equations Monolayers Excitonic state population inversion Electromagnetic waves Condensed matter physics Graphene Electromagnetic field theory Bilayer intensive electromagnetic radiation Electromagnetic fields Electromagnetic wave emission Quantum kinetic equations Energy gap Photonics monolayer and bilayer graphene Population inversions Bilayer Graphene Bilayer graphene Graphene nanoribbons |
| Zdroj: | Proceedings of SPIE-The International Society for Optical Engineering 4th International Symposium on Optics and Biophotonics, SFM 2016 |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2266957 |
| Popis: | We develop a microscopic theory of a strong electromagnetic radiation interaction with bilayer graphene where an energy gap is opened by a static electric field perpendicular to graphene planes. We show that an adiabatic changing on time of the gate potentials (that leads to the resonance of the energy gap with electromagnetic field) may produce full inversion of the electron population between valence and conduction bands. Quantum kinetic equations for density matrix are obtained by the use of a tight-binding approach within second quantized Hamiltonian in an intense laser field and taking into account Coulomb correlations between particles. Excitonic absorption in graphene systems (monolayer and bilayer) with opened energy gap is investigated for different values of the gap and the parameters describing the band structure. © 2016 SPIE. 10337 Sponsors: et al. IEEE - The Photonics Society Russian Academy of Sciences Russian Foundation for Basic Research Russian Technology Platform "The Medicine of the Future" The Optical Society Conference code: 127523 |
| Databáze: | OpenAIRE |
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