Abstract
We calculate theoretically the optical conductivity in the bilayer graphene by considering Kubo-Green-Matsubara formalism. Different regimes of the interlayer coupling parameter have been considered in the paper. We show that the excitonic effects substantially affect the optical conductivity spectrum at the high-frequency regime when considering the full interaction bandwidth, leading to a total suppression of the usual Drude intraband optical transition channels and by creating a new type of optical gap. We discuss the role of the interlayer coupling parameter and the Fermi level on the conductivity spectrum, going far beyond the usual tight-binding approximation scheme for the extrinsic bilayer graphene.
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Apinyan, V., Kopeć, T.K. High energy shift in the optical conductivity spectrum of the bilayer graphene. Eur. Phys. J. B 91, 310 (2018). https://doi.org/10.1140/epjb/e2018-90407-y
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DOI: https://doi.org/10.1140/epjb/e2018-90407-y