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Symmetry breaking effect on persistent current in graphene rings

Author

Listed:
  • Ning Xu

    (Yancheng Institute of Technology)

  • Hai-Yang Zhang

    (Yancheng Institute of Technology)

  • Ming Qiu

    (University of Wisconsin Milwaukee)

  • Jian-Wen Ding

    (Xiangtan University)

Abstract

We calculate the electronic structure and persistent current of graphene rings based on tight binding theory. The sixfold rotational symmetrical graphene rings exhibit diamagnetic response with carriers flowing anticlockwise along the rings. When symmetry is broken by defect, these rings remain diamagnetic response. While for asymmetrical graphene ring with the same size, the typical current is several orders of magnitude smaller than that of sixfold rotational symmetrical graphene ring. Especially, the asymmetrical graphene rings exhibit not only diamagnetic but also paramagnetic response.

Suggested Citation

  • Ning Xu & Hai-Yang Zhang & Ming Qiu & Jian-Wen Ding, 2017. "Symmetry breaking effect on persistent current in graphene rings," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(8), pages 1-6, August.
    • Handle: RePEc:spr:eurphb:v:90:y:2017:i:8:d:10.1140_epjb_e2017-80226-1
    DOI: 10.1140/epjb/e2017-80226-1
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    Keywords

    Solid State and Materials;

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