外尔半金属TaAs单晶的研究进展

发布时间：2018-06-01 19:12

本文选题：外尔半金属 + TaAs单晶　；参考：《材料导报》2017年15期

【摘要】：外尔半金属是当两个自旋非简并能带在三维动量空间通过费米能级附近时,其低能准粒子激发具有外尔费米子的所有特征的一类材料体系。外尔费米子是狄拉克方程的无质量解,可以看作是在三维空间一对重叠在一起且具有相反手性的粒子。TaAs单晶作为一种非磁性的外尔半金属,在其中能够观测到外尔费米子,并产生许多奇异的物理现象,如费米弧、负磁阻效应、量子反常霍尔效应等,使其在发展新型电子器件和拓扑量子计算等领域有着重要应用潜力。介绍了外尔半金属的相关基础理论和重要实验,重点探讨了TaAs单晶生长相关的技术问题,分析了化学气相传输法的优缺点。
[Abstract]:The Weir half-metal is a kind of material system in which two spin nondegenerate energy bands pass through the Fermi energy level in the three-dimensional momentum space and their low energy quasiparticles excite all the characteristics of the Verfermion. The Verfermion is a massless solution of the Dirac equation. It can be regarded as a pair of superimposed particles with opposite chiral properties in three-dimensional space. As a nonmagnetic Weir half-metal, Werfermions can be observed in them. Many strange physical phenomena, such as Fermi arc, negative magnetoresistive effect, quantum anomalous Hall effect and so on, have important application potential in the development of new electronic devices and topological quantum computing. In this paper, the basic theory and important experiments of Weir half-metal are introduced, the technical problems related to the growth of TaAs single crystal are discussed, and the advantages and disadvantages of the chemical vapor transport method are analyzed.
【作者单位】：上海应用技术大学材料科学与工程学院晶体生长研究所;
【基金】：国家自然科学基金(51572175) 上海高校青年教师培养资助计划项目(ZZyy15087) 江苏省博士后科研资助计划(1501131C)
【分类号】：O78

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