期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3309775
关键词
graphene; nanostructured materials; spin polarised transport
资金
- National Natural Science Foundation of China [60871065, 10674044]
- Ministry of Science and Technology of China [2006CB605105]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [200805320011]
- Hunan Provincial Natural Science Foundation of China [06JJ20004]
Spin-dependent electronic transport properties in zigzag graphene nanoribbons (ZGNRs) are studied using first-principles quantum transport calculations. The effects of the symmetry and defect have been considered. The results show that when the spin polarization is considered, both symmetric and asymmetric ZGNRs present semiconductor behavior, which is different from spin-unpolarized result. The symmetry of ZGNRs plays an important role in electron transport behavior. Asymmetric ZGNR displays monotonic transport behavior. However, in symmetric ZGNRs systems, negative differential resistance is observed. The influence of defect is more obvious in symmetric ZGNRs than in asymmetric systems. A physical analysis of these results is given.
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