Spin-polarized current generated by carbon chain and finite nanotube

被引:11
作者
Guo, Y. D. [1 ]
Yan, X. H. [1 ]
Xiao, Y. [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Sci, Nanjing 210016, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
SPINTRONICS; TRANSPORT; FUTURE;
D O I
10.1063/1.3510537
中图分类号
O59 [应用物理学];
学科分类号
摘要
Inspired by recent progress of experimental fabrication of carbon structure [Borrnert et al., Phys. Rev. B 81, 085439 (2010)], we proposed a scheme to generate spin-polarized current based on an all-carbon system consisting of carbon nanotube and chain. The transmission spectra are calculated based on density functional theory combined with nonequilibrium Green's function method. It is found that the spin-polarized current can be achieved in the proposed system by partial contact between nanotube and chain, without using the dopants, ferromagnetic electrodes, and external electric field. Moreover, our results show that the device containing carbon nanotubes with large length and diameter can produce the current with 100% spin polarization, which is essential for spintronic devices. Physical mechanisms and the comparison with the results of graphene are also discussed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3510537]
引用
收藏
页数:7
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