Spin-polarized transport in graphene nanoribbon superlattices

被引：0
|
作者：
余欣欣 [1 ]
谢月娥 [1 ]
欧阳滔 [1 ]
陈元平 [1 ]
机构：
[1] Institute of Physics and Laboratory for Quantum Engineering and Micro-Nano Energy Technology,Xiangtan University
来源：
Chinese Physics B | 2012年 / 21卷 / 10期
基金：
中国国家自然科学基金;
关键词：
spintronics; superlattices; zigzag graphene nanoribbons;
D O I：
暂无
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
By the Green’s function method,we investigate spin transport properties of a zigzag graphene nanoribbon superlattice(ZGNS) under a ferromagnetic insulator and edge effect.The exchange splitting induced by the ferromagnetic insulator eliminates the spin degeneracy,which leads to spin-polarized transport in structure.Spin-dependent minibands and minigaps are exhibited in the conductance profile near the Fermi energy.The location and width of the miniband are associated with the geometry of the ZGNS.In the optimal structure,the spin-up and spin-down minibands can be separated completely near the Fermi energy.Therefore,a wide,perfect spin polarization with clear stepwise pattern is observed,i.e.,the perfect spin-polarized transport can be tuned from spin up to spin down by varying the electron energy.
引用
收藏
页码：414 / 418
页数：5
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