Symmetry breaking effect on persistent current in graphene rings

Ning Xu (), Hai-Yang Zhang, Ming Qiu and Jian-Wen Ding
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Ning Xu: Yancheng Institute of Technology
Hai-Yang Zhang: Yancheng Institute of Technology
Ming Qiu: University of Wisconsin Milwaukee
Jian-Wen Ding: Xiangtan University

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 8, 1-6

Abstract: 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 (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80226-1

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