Tunable excitons in gated graphene systems

Anahit P. Djotyan; Artak A. Avetisyan; Konstantinos Moulopoulos

doi:10.1117/12.2266957

14 April 2017 Tunable excitons in gated graphene systems

Anahit P. Djotyan, Artak A. Avetisyan, Konstantinos Moulopoulos

Proceedings Volume 10337, Saratov Fall Meeting 2016: Laser Physics and Photonics XVII; and Computational Biophysics and Analysis of Biomedical Data III; 1033703 (2017) https://doi.org/10.1117/12.2266957
Event: Saratov Fall Meeting 2016: Fourth International Symposium on Optics and Biophotonics, 2016, Saratov, Russian Federation

Abstract

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.

Citation Download Citation

Anahit P. Djotyan, Artak A. Avetisyan, and Konstantinos Moulopoulos "Tunable excitons in gated graphene systems", Proc. SPIE 10337, Saratov Fall Meeting 2016: Laser Physics and Photonics XVII; and Computational Biophysics and Analysis of Biomedical Data III, 1033703 (14 April 2017); https://doi.org/10.1117/12.2266957

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KEYWORDS

Graphene

Absorption

Excitons

Particles

Electromagnetic radiation

Polarization

Electromagnetism

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