High energy shift in the optical conductivity spectrum of the bilayer graphene

Vardan Apinyan () and Tadeusz K. Kopeć
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Vardan Apinyan: Institute of Low Temperature and Structure Research, Polish Academy of Sciences
Tadeusz K. Kopeć: Institute of Low Temperature and Structure Research, Polish Academy of Sciences

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 12, 1-13

Abstract: 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. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-90407-y

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