Transport properties of mesoscopic graphene rings |
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Authors: | N Xu JW DingBL Wang DN ShiHQ Sun |
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Institution: | a Department of Physics, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China b Department of Physics, Xiangtan University, Xiangtan 411105, Hunan, China c Department of Physics, Nanjing university of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China |
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Abstract: | Based on a recursive Green's function method, we investigate the conductance of mesoscopic graphene rings in the presence of disorder, in the limit of phase coherent transport. Two models of disorder are considered: edge disorder and surface disorder. Our simulations show that the conductance decreases exponentially with the edge disorder and the surface disorder. In the presence of flux, a clear Aharonov-Bohm conductance oscillation with the period Φ0 (Φ0=h/e) is observed. The edge disorder and the surface disorder have no effect on the period of AB oscillation. The amplitudes of AB oscillations vary with gate voltage and flux, which is consistent with the previous results. Additionally, ballistic rectification and negative differential resistance are observed in I-V curves, with on/off characteristic. |
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Keywords: | Electronic transport Graphene rings |
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