拓扑绝缘体/超导体中的量子磁杂质效应及相关输运理论

项目名称： 拓扑绝缘体/超导体中的量子磁杂质效应及相关输运理论

项目编号： No.11474106

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 王瑞强

作者单位： 华南师范大学

项目金额： 90万元

中文摘要： 引入磁性杂质是深入理解时间反演对称性拓扑量子态最有效的方法，也是探索新奇量子效应的有力手段。目前，大多数理论研究主要建立在经典磁杂质模型基础上。为了更深入地理解其物理本质，本申请项目将以量子磁杂质模型为基础开展研究，突出拓扑量子态与磁杂质内部自由度（如磁量子激发、电子互作用等微观机制）的相互影响。具体研究内容包括：1）研究量子磁杂质与拓扑量子态电子之间的关联特性，寻找探测、调控拓扑量子态的理论方案。2）研究自旋-轨道耦合与电子互作用之间的竞争及 Kondo效应，从一个新角度理解磁杂质背散射压抑及Dirac点能隙现象。3）研究高自旋单分子磁体的 Kondo效应及其自旋翻转，探讨自旋-动量锁定对分子磁各向异性的影响。4）利用 Majorana-量子磁杂质耦合系统探测 Majorana 费米子，从输运上特征化Majorana准粒子。 本项目既能深入理解拓扑材料，又能为开发自旋电子器件提供新思路。

中文关键词： 自旋电子学；拓扑绝缘体；杂质效应；近藤效应

英文摘要： Introduction of magnetic impurities is an effective way to understand the time-invariant symmetric topological quantum states best, and also is powerful tool to explore the novel quantum effect. Presently, most theoretical investigations are mainly based on classic magnet of impurities. In order to deeply understand the underlying physics in topological materials, this project is studied based on quantum magnet of impurities, emphasizing the interplay between topological quantum states and internal degrees of impurities (such as excitations of magnetic quantum and electron-electron interactions). The contents are included as follows. 1)Study the interaction between quantum magnetic impurities and topological quantum states, searching for the theoretical approach to explore and control the topological quantum states. 2) Study the competition between spin-orbital coupling and electron-electron interactions, and the Kondo effect. Our purpose is to understand the suppression of backscatting with respect to magnetic impurities and the opening gap in Dirac cone from a different aspect. 3)Study the Kondo effect in single-molecular magnets with high spin and its flip, focusing on the influence of spin-momentum locking on molecular magnetic anisotropy. 4)Explore the Majorana fermion in a Majorana-quantum magnetic impurity coupling system, characterizing the Majorana quasi-particle from transport properties. This project will not only give a deep understanding of the topological materials, but also provide new ideas to design spintronic devices.

英文关键词： spintronics;topological insulator;impurity effect;Kodon effect