Weyl半金属TaAs/NbAs在极端条件下的输运性质研究

项目名称： Weyl半金属TaAs/NbAs在极端条件下的输运性质研究

项目编号： No.11504054

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 董金奎

作者单位： 复旦大学

项目金额： 24万元

中文摘要： 以拓扑绝缘体为代表的凝聚态物理系统中的不寻常拓扑现象受到了科学界空前的关注。拓扑半金属也是一类全新的拓扑电子态,它的费米能级正好位于两支能带的交叉点上。它类似于三维的石墨烯，会呈展出很多新奇的量子现象。本课题计划研究最近理论预言的一类Weyl半金属TaAs/NbAs的电、热输运性质。Weyl半金属中的准粒子用具有手性的相对论Weyl方程描写。申请人计划通过极端条件（极低温、强磁场、高压）下的多种测量手段探测这类材料中可能存在的新奇量子物态，比如量子振荡、Adler-Bell-Jackiw(ABJ)异常和反常霍尔效应等。

中文关键词： 拓扑半金属；新奇量子态；极端条件；物性测量

英文摘要： The recent developments in topological insulators have highlighted the important role of topology in defining phases of matter. Topological semimetals represent a new quantum state of matter which are essentially free fermion phases where band topology can be defined even though the energy gap closes at certain points in the Brillouin zone. This makes it a 3D electronic analogue of graphene, and will show exotic topological phenomena. In this project, I will focus mainly on the proposed three dimensional Weyl semimetals TaAs/NbAs and its unusual surface states that take the form of Fermi arcs. In Weyl semimetals, the low energy excitations of this topological state are modeled by the Weyl equation of particle physics. Under extreme conditions, various experimental techniques will be used to detect its topological response, including the quantum oscillations, the Adler-Bell-Jackiw (ABJ) anomaly and anomalous Hall effect.

英文关键词： topological semimetal;novel quantum states;extreme conditions;study of the physical properties