Designing of spin filter devices based on zigzag zinc oxide nanoribbon modified by edge defect

作     者：Bao-Rui Huang Fu-Chun Zhang Yan-Ning Yang Zhi-Yong Zhang Wei-Guo Wang 黄保瑞;张富春;杨延宁;张志勇;王卫国

作者机构：School of Information Science TechnologyNorthwest UniversityXi’an 710127China School of Physics and Electronic InformationYan’an UniversityYan’an 716000China 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61664008 and 11604286) the Scientific Technological Innovation Team of Yan’an City,China(Grant No.2017CXTD-01) 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第10期

页      码：585-589页

摘      要：The spin-dependent electronic transport properties of a zigzag zinc oxide(ZnO) nanoribbon are studied by using density functional theory with non-equilibrium Green s functions. We calculate the spin-polarized band structure, projected density of states, Bloch states, and transmission spectrum of the ZnO nanoribbon. It is determined that all Bloch states are located at the edge of the ZnO nanoribbon. The spin-up transmission eigenchannels are contributed from Zn 4s orbital,whereas the spin-down transmission eigenchannels are contributed from Zn 4s and O 2p orbitals. By analyzing the current-voltage curves for the opposite spins of the ZnO nanoribbon device, negative differential resistance(NDR) and spin filter effect are observed. Moreover, by constructing the ZnO nanoribbon modified by the Zn-edge defect, the spin-up current is severely suppressed because of the destruction of the spin-up transmission eigenchannels. However, the spin-down current is preserved, thus resulting in the perfect spin filter effect. Our results indicate that the ZnO nanoribbon modulated by the edge defect is a practical design for a spin filter.

主 题 词：ZnO nanoribbon spin-dependent transport nonequilibrium Green's functions transmission eigenchannels spin filtering efficiency 

学科分类：07[理学] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1088/1674-1056/ab3b50

馆 藏 号：203787414...