超导异质结Bi2Te3/FeTe的能隙大小、对称性和拓扑属性研究

近年来，拓扑超导中的元激发或缺陷态呈现出诸多新奇的物理现象，极大丰富了人们对非传统超导的认知，成为凝聚态物理领域的前沿热点之一。拓扑超导体作为实现和探索马约拉纳费米子最有希望的载体，有助于实现新一类容错拓扑量子计算。因此，拓扑超导的研究不仅对基础物理探索具有重大的意义，还对量子信息领域表现出可观的应用前景。然而，拓扑超导中的超导配对机制、对称性与非平庸拓扑属性关系等问题仍然存在诸多争议。本项目拟针对这些问题，结合面内转角测量电磁学性质、点接触安德烈夫反射谱、中子散射和核磁共振等多种实验手段，对Bi2Te3/FeTe等典型拓扑超导体系的能隙大小、对称性、超导涡旋图案和奈特位移等性质展开系统全面的研究，从本质上理解非平庸几何相位与电子关联诱导超导性等相互作用的根源。本项目的成功实施将有助于澄清拓扑超导的配对机制，丰富和拓宽非传统超导领域的新现象、新规律。

Topological superconductivity is a newly developed hot research topic in condensed matter physics, due to the novel physical phenomena about elementary excitations or defect states in topological materials, which has enriched the knowledges to unconventional superconductivity. As a possible platform that can host Majorana fermions, topological superconductors are of practical importance to the application of fault-tolerant quantum computing. Therefore, it is of particular interest not only to fundamental research, but also to the application of quantum information area. However, the paring symmetry and topological properties remain unclear in topological superconductivity. In this project, we plan to investigate on Bi2Te3/FeTe combining multiple experimental techniques, including the angle-resolved electric transport, point-contact Andreev reflection spectroscopy, neutron scattering and NMR, to study the superconducting gap magnitude, symmetry, vortex lattice pattern and Knight shift of each. The experimental results shall be used to answer the forementioned scientific questions. Successful development of this project shall provide easily accessible platform and new insights for investigating topological superconductivity.