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

Author

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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)

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

Suggested Citation

  • Vardan Apinyan & Tadeusz K. Kopeć, 2018. "High energy shift in the optical conductivity spectrum of the bilayer graphene," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(12), pages 1-13, December.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:12:d:10.1140_epjb_e2018-90407-y
    DOI: 10.1140/epjb/e2018-90407-y
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    Keywords

    Solid State and Materials;

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