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Mutual influence of uniaxial tensile strain and point defect pattern on electronic states in graphene

Author

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  • Iyor Yu. Sagalianov

    (Dept. of General Physics, Taras Shevchenko National University of Kyiv)

  • Taras M. Radchenko

    (Dept. of Metallic State Theory, G. V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine)

  • Yuriy I. Prylutskyy

    (Dept. of Biophysics, Institute of Biology and Medicine, Taras Shevchenko National University of Kyiv)

  • Valentyn A. Tatarenko

    (Dept. of Metallic State Theory, G. V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine)

  • Pawel Szroeder

    (Institute of Physics, Kazimierz Wielki University)

Abstract

The study deals with electronic properties of uniaxially stressed mono- and multi-layer graphene sheets with various kinds of imperfection: point defects modelled as resonant (neutral) adsorbed atoms or molecules, vacancies, charged impurities, and local distortions. The presence of randomly distributed defects in a strained graphene counteract the band-gap opening and even can suppress the gap occurs when they are absent. However, impurity ordering contributes to the band gap appearance and thereby re-opens the gap being suppressed by random dopants in graphene stretched along zigzag-edge direction. The band gap is found to be non-monotonic with strain in case of mutual action of defect ordering and zigzag deformation. Herewith, the minimal tensile strain required for the band-gap opening (≈12.5%) is smaller than that for defect-free graphene (≈23%), and band gap energy reaches the value predicted for maximal nondestructive strains in the pristine graphene. Effective manipulating the band gap in graphene requires balanced content of ordered dopants: their concentration should be sufficient for a significant sublattice asymmetry effect, but not so much that they may suppress the band gap or transform it into the “quasi- (or pseudo-) gap”.

Suggested Citation

  • Iyor Yu. Sagalianov & Taras M. Radchenko & Yuriy I. Prylutskyy & Valentyn A. Tatarenko & Pawel Szroeder, 2017. "Mutual influence of uniaxial tensile strain and point defect pattern on electronic states in graphene," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(6), pages 1-9, June.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:6:d:10.1140_epjb_e2017-80091-x
    DOI: 10.1140/epjb/e2017-80091-x
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    Keywords

    Solid State and Materials;

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