不同位置的Mn掺杂对ZnO量子点的电磁特性影响  

Influence of Mn doping at different positions on electronic and magnetic properties of ZnO quantum dot

作　　者：雷涛 符斯列 王春安[3] 缪晶 王琳涵 LEI Tao;FU Si-Lie;WANG Chun-An;MIAO Jing;WANG Lin-Han(Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Nuclear Science,Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China;School of Electronic and Information,Guangdong Polytechnic Normal University,Guangzhou 510665,China)

机构地区：[1]华南师范大学物理与电信工程学院广东省量子调控工程与材料重点实验室,广州510006 [2]华南师范大学量子物质研究院广东省核物质科学与技术重点实验室,广州510006 [3]广东技术大学电子与信息学院,广州510665

出　　处：《原子与分子物理学报》2021年第6期157-164,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10575039);广东省高校特色创新项目(2018KTSCX121);广东省自然科学基金(S2013010012548)。

摘　　要：采用基于态密度泛函理论的第一性原理赝势法,分析了直径为1.2 nm的ZnO量子点体系(Zn_(45)O_(45)H_(72),并经H钝化)在中心、中间、表面三种不同位置Mn掺杂情况下的晶体结构、能带结构、态密度分布和磁性.模拟结果表明:中间位置掺杂时,体系的结合能最低,同时导电性能最好;中心位置掺杂略劣于中间位置掺杂;而表面位置掺杂时,结合能明显偏高,同时导电性能明显减弱.在磁性方面,随着掺杂位置变化,体系中各原子的总磁矩和磁矩分布会发生明显变化,但体系的总磁矩基本不变.The crystal structures,band structures,densities of states and magnetisms of ZnO quantum dot systems(Zn_(45)O_(45)H_(72),passivated by H)with diameter of 1.2 nm and Mn doping at the center,middle and surface positions are analyzed by the first principles pseudopotential method based on the density of states functional theory.The results show that the binding energy is the lowest and the conductivity is the best when doping in the middle position;the doping in the center is slightly worse than that in the middle;when doping on the surface,the binding energy is higher and the conductivity is weakened.In terms of magnetism,with the change of doping position,the total magnetic moment and the distribution of magnetic moment of each atom in the system will change obviously,but the total magnetic moment of the system is basically unchanged.

关 键 词：ZnO量子点 MN掺杂 第一性原理 磁性 

分 类 号：O48[理学—固体物理]