自旋电子学
石墨烯
凝聚态物理
石墨烯纳米带
材料科学
铁磁性
旋转
电子
自旋(空气动力学)
纳米
电场
之字形的
纳米技术
物理
量子力学
热力学
复合材料
数学
几何学
作者
Young‐Woo Son,Marvin L. Cohen,Steven G. Louie
出处
期刊:Nature
[Springer Nature]
日期:2006-11-16
卷期号:444 (7117): 347-349
被引量:3990
摘要
Electrical current can be completely spin polarized in a class of materials known as half-metals, as a result of the coexistence of metallic nature for electrons with one spin orientation and insulating for electrons with the other. Such asymmetric electronic states for the different spins have been predicted for some ferromagnetic metals - for example, the Heusler compounds- and were first observed in a manganese perovskite. In view of the potential for use of this property in realizing spin-based electronics, substantial efforts have been made to search for half-metallic materials. However, organic materials have hardly been investigated in this context even though carbon-based nanostructures hold significant promise for future electronic device. Here we predict half-metallicity in nanometre-scale graphene ribbons by using first-principles calculations. We show that this phenomenon is realizable if in-plane homogeneous electric fields are applied across the zigzag-shaped edges of the graphene nanoribbons, and that their magnetic property can be controlled by the external electric fields. The results are not only of scientific interests in the interplay between electric fields and electronic spin degree of freedom in solids but may also open a new path to explore spintronics at nanometre scale, based on graphene.
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