Symmetry breaking effect on persistent current in graphene rings

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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.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Ning Xu
    • 1
  • Hai-Yang Zhang
    • 1
  • Ming Qiu
    • 2
  • Jian-Wen Ding
    • 3
  1. 1.Department of PhysicsYancheng Institute of TechnologyYanchengP.R. China
  2. 2.Department of Mechanical EngineeringUniversity of Wisconsin MilwaukeeMilwaukeeUSA
  3. 3.Department of PhysicsXiangtan UniversityXiangtanP.R. China

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