Open AccessPersistent currents in mesoscopic graphene rings with armchair edges
Author(s) -
Dai Nan,
Wei Deng
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.017302
Subject(s) - mesoscopic physics , persistent current , physics , graphene , magnetic flux , condensed matter physics , symmetry (geometry) , quantum , flux (metallurgy) , energy spectrum , quantum mechanics , magnetic field , geometry , materials science , mathematics , metallurgy
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.