Disorder-based graphene spintronics
Disorder-based graphene spintronics
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DOI：
10.1088/0957-4484/21/34/345202
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发表时间：
2010-08-27
期刊：
影响因子：
3.5
通讯作者：
da Silva, Antonio J. R.
中科院分区：
文献类型：
--
作者：
Rocha, A. R.;Martins, Thiago B.;da Silva, Antonio J. R.
使用电子的自旋作为最终的逻辑位--在所谓的自旋电子学中--可以导致一种新的思考信息流的方式。与此同时，单层石墨烯由于其在纳米级电子学中的潜在应用而一直是激烈研究的主题。虽然缺陷可以显著改变纳米级系统的电子特性，但缺乏控制可能导致由这些杂质的随机排列引起的看似有害的影响。在这里，我们证明，使用从头算密度泛函理论和非平衡绿色的功能计算，它是可能的，以获得完美的自旋选择性掺杂石墨烯纳米带产生一个完美的自旋过滤器。我们表明，最初未极化的电子进入系统引起100%的极化的电流由于随机无序。这种效应被解释在不同的本地化长度为每个自旋通道，导致一个新的机制，自旋过滤效应是无序驱动的。
The use of the spin of the electron as the ultimate logic bit-in what has been dubbed spintronics-can lead to a novel way of thinking about information flow. At the same time single-layer graphene has been the subject of intense research due to its potential application in nanoscale electronics. While defects can significantly alter the electronic properties of nanoscopic systems, the lack of control can lead to seemingly deleterious effects arising from the random arrangement of such impurities. Here we demonstrate, using ab initio density functional theory and non-equilibrium Green's functions calculations, that it is possible to obtain perfect spin selectivity in doped graphene nanoribbons to produce a perfect spin filter. We show that initially unpolarized electrons entering the system give rise to 100% polarization of the current due to random disorder. This effect is explained in terms of different localization lengths for each spin channel which leads to a new mechanism for the spin filtering effect that is disorder-driven.