若干铋基材料的拓扑物性研究

拓扑量子态包含了拓扑绝缘态和拓扑半金属态，因其在基础研究以及实际应用方面具有重大意义而备受关注。考虑到现有的大多数拓扑态的材料体系仍不够理想，迫切需要设计发掘更多更好的材料体系。同时，也还有很多未知的拓扑态等待我们去探索。铋是在周期表中除了放射性元素外具有最大自旋轨道耦合强度的元素，可以期待在铋基材料中拓扑量子态可以更加显著的展现出来。本项目主要关注弱拓扑绝缘体、Weyl半金属、量子自旋霍尔态以及量子反常霍尔态等，力求在包含具有铋元素的材料体系的拓扑物性研究中实现关键性突破，设计寻找出性能优异的材料体系以及新型拓扑量子态，并进行相关物性调控，启发和指引进一步实验以及应用研究。在本项目的资助下，争取在预测新型拓扑态以及拓扑材料方面取得原创性科学发现。

Topological quantum states, containing topological insulating states and topological semi-metallic states, have attracted much attention due to their significance in basic research and practical application. Considering that the materials now available of most topological states are still not ideal, it is urgent to design and find out the more and better materials. At the same time, there are many unknown topological states waiting for us to explore. Bismuth is the element that has the largest strength of spin-orbit coupling in the periodic table except the radioactive elements. It is expected that the topological states are more remarkable in the Bi-based materials. In this project, we mainly focus on weak topological insulators, Weyl semi-metals, quantum spin Hall states, quantum anomalous Hall states and so on. We strive to achieve key breakthroughs in the study of the topological properties of the materials containing Bi element, and design and find out the materials with excellent performance and new topological states, which will inspire and guide the next stage experiments and application research. With the support of this project, we will try our best to gain the original scientific discoveries in predicting new topological states and materials.