拓扑量子材料异质结构薄膜的实验研究

拓扑量子态研究是凝聚态物理的重要新兴领域，如何对拓扑态进行调控是探索其对未来科技是否能够产生重要影响的关键基础科学问题。本项目计划研究如何利用高精度的分子束外延技术获得在原子结构和电子结构方面都合适的拓扑量子态材料和其他量子态材料复合形成的双层和三明治结构异质薄膜。以拓扑/磁性、拓扑/铁电以及拓扑/超导为主要研究对象。通过具有界面电子态探测能力的低能激光角分辨光电子能谱以及同步辐射软x射线共振角分辨光电子能谱探测复合界面上的边缘态变化，并利用磁性和电输运测量来探测拓扑边缘态是否在界面上和磁、电场发生强耦合，以此为基础来探索基于拓扑态调控的拓扑电子学器件原型的可行性。在拓扑/超导异质薄膜体系中初步探索如何制备出满足拓扑量子计算理论方案的实验构型。

Study of topological quantum states becomes a very important new field in condensed matter physics. How to control the topological state is a key fundamental scientific problem to explore the possibility whether topological materials can have important impact on future technology. In this project, we plan to study how to obtain bilayer and sandwich-like heterostructure between topological quantum materials and other quantum materials with properly atomic and electronic structure by using accurate molecular beam epitaxy. We will mainly focus on the topological/magnetic, topological/ferroelectric, topological/superconducting heterostructures. We will investigate the edge states in the interface of the heterostructures by low energy laser based ARPES and soft x-ray resonant ARPES. We will also investigate whether the topological edge state in the interface is strongly coupled with interface magnetic or electric field and test the capability of fabricating some topological electronic device protype. In topological material/superconductor heterostructure, we will explore how to fabricate suitable experimental geometry for the theoretical proposals on topological quantum computation in the first step.