期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 45, 期 2, 页码 1165-1174出版社
SPRINGER
DOI: 10.1007/s11664-015-4233-3
关键词
Rectification; spin filtering; negative differential resistance; doping; zigzag graphene
资金
- National Natural Science Foundation of China [21301111, 21503122]
- Program for New Century Excellent Talents in University [NCET-11-1033]
- Natural Science Foundation of Shanxi Province [2013011007-3]
- Datong City Scientific and Technological Project of China [201315, 201422-5]
The magnetic and spin transport properties of asymmetric edge-hydrogenated zigzag graphene nanoribbons (ZGNRs) selectively doped with nitrogen atoms were investigated using spin-polarized density functional theory and non-equilibrium Green's function. Results show that the rectifying performance of spin-polarized current with a ratio higher than 10 5 can be modulated by changing the positions of the nitrogen dopant. Complete spin filtering (100%) and excellent negative differential resistance behaviors were observed in the ZGNR junctions. These doping position-dependent spin transport characteristics were further tested by shifting from the odd-numbered zigzag-shaped C chains (N-Z) to the even-numbered N-Z in ZGNRs. This study suggests that adopting a suitable nitrogen doping position could be an effective approach to significantly enhance the rectifying behavior of asymmetric edge-hydrogenated ZGNRs, which are promising materials for multifunctional spintronic devices.
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