期刊
PHYSICA B-CONDENSED MATTER
卷 478, 期 -, 页码 84-88出版社
ELSEVIER
DOI: 10.1016/j.physb.2015.08.045
关键词
Disorder; Transport property; Graphene
资金
- Natural Science Foundation of Jiangsu Province, China [BK20140129]
- NSFC [61178032]
We study the effect of short-range disorder on the localization property of the electronic state in zigzag graphene, via the calculation of the two-terminal dc conductance with the transfer matrix method. When the disorder is weak, the electron states are localized. However, when the disorder crosses the critical strength, the conductance will be enhanced and may be even quantized as e(2)/h at the specific disorder strength. Our numerical calculations suggest that the quantized conductance shows certain robustness to the system size, shape and the Fermi energy. We demonstrate the unconventional behavior from the localization length and the density of states and attribute it to the existence of edge states. The implications of our results are discussed. (C) 2015 Elsevier B.V. All rights reserved.
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