期刊论文

Deng Xiao-Qing

中文

物理学报

1000-3290

2016

65

6

068503-1-068503-07

10.7498/aps.65.068503

(61371065,61201080):国家自然科学基金 (2015JJ3002):湖南省自然科学基金 :湖南省重点学科建设项目 (Grant ,61371065,61201080):湖南省高校科技创新团队支持计划和长沙理工大学创新项目资助的课题.* Project supported by the National Natural Science Foundation of China (Grant 2015JJ3002):the Hunan Provincial Natural Science Foundation, China :the Construct Program of the Key Discipline in Hunan Province, the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province, and the Scientific Research Innovation Fund for Postgraduate of Changsha University of Science and Technology

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基于密度泛函理论第一原理系统研究了界面铁掺杂锯齿(zigzag)形石墨烯纳米带的自旋输运性能,首先考虑了宽度为4的锯齿(zigzag)形石墨烯纳米带,构件了4个纳米器件模型,对应于中心散射区的长度分别为N=4, 6, 8和10个石墨烯单胞的长度,铁掺杂在中心区和电极的界面.发现在铁磁(FM)态,四个器件的β自旋的电流远大于α自旋的电流,产生了自旋过滤现象;而界面铁掺杂的反铁磁态模型,两种电流自旋都很小,无法产生自旋过滤现象;进一步考虑电极的反自旋构型,器件电流显示出明显的自旋过滤效应.探讨了带宽分别为5和6的纳米器件的自旋输运性能,中心散射区的长度为N=6个石墨烯单胞的长度, FM态下器件两种自旋方...

By using the first-principles method based on the density-functional theory, the spin transport properties for the systems consisting of iron-doped zigzag-edged graphene nanoribbons (ZGNRs) with iron doping at the interface, where the connection is realized between electrodes and the central scattering region, are investigated theoretically. The ribbon widths of ZGNRs are four zigzag C chains (4 ZGNRs), and the length of scattering region is N unit cells (here, N = 4, 6, 8, 10). Results show that β-spin current is obviously greater than the α...