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Persistent currents in mesoscopic graphene rings with armchair edges

Dai Nan Deng Wen-Ji

Persistent currents in mesoscopic graphene rings with armchair edges

Dai Nan, Deng Wen-Ji
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Publishing process
  • Received Date:  29 July 2014
  • Accepted Date:  30 August 2014
  • Published Online:  05 January 2015

Persistent currents in mesoscopic graphene rings with armchair edges

  • 1. Department of physics, South China University of Technology, Guangzhou 510641, China
Fund Project:  Project supported by the National Natural Science Foundation of China(Grant No. 11004063), and the Fundamental Research Funds for the Central Universities, China(Grant No. 2014ZG0044).

Abstract: Based on the tight-binding model, the energy spectrum and persistent currents of mesoscopic graphene rings with armchair edges are studied analytically and numerically. Characters of the persistent currents changing with Aharonov-Bohm (A-B) magnetic flux in rings in different geometry are investigated in datail. The periodicity and special symmetry of energy spectrum and persistent currents changing with the magnetic flux are revealed. It is demonstrated that the persistent currents are determined by the geometric structures of the rings; the quantum states with small eigen-energies may carry much larger currents than those quantum states with eigen-energies far away from zero.

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