外场调控下类碳单层材料的Josephson效应研究

由硅、锗和锡等单质构成的类碳单层材料因为其低维度性和翘曲结构所带来的奇异物理性质和巨大的应用前景而备受人们关注。虽然基于这些类碳单层材料的Josephson效应研究已经取得一些成果，但其研究内容的广度、深度和应用价值有待于进一步探究。有鉴于此，本项目以具有强自旋轨道耦合、铁磁性和反铁磁性等材料为衬底，通过应变场、偏振光、电场和磁场等外场调控来研究类碳单层材料的Josephson效应，探索高性能拓扑量子器件和超导器件的设计。研究内容主要包括三个方面：研究谷依赖的0-π转变、φ0 结和φ结；继续研究受拓扑保护的0-π转变、φ0 结和φ结；进一步探讨拓扑超导体的实现和Majorana零能模的调控，并分析Majorana零能模对Josephson流的影响。可以预期本项目的研究成果对于丰富类碳单层材料超导和拓扑输运性质的研究内涵，推动类碳单层材料在高性能拓扑量子器件和超导器件上的应用具有重要意义。

Graphene-like materials, such as silicene, germanene, and stanene, have attracted much attention due to their novel properties and broad application prospect. Although the research of Josephson effect in graphene-like materials has obtained some interesting results, the scope, the depth, and the applied value of research content need to be explored further. By adjusting external fields such as strain, polarized light, electric and magnetic fields, this project aims to study the Josephson effect in graphene-like materials which are on the substrate with strong spin-orbit coupling, ferromagnetism, and antiferromagnetism, and then try to discuss the design of topological quantum and superconducting devices with high-performance. The main research content contain three aspects: studying the valley-dependent 0-π transition, φ0 and φ junctions; investigating the topology-protected 0-π transition, φ0 and φ junctions; discussing the realization of topological superconductor and the manipulation of Majorana zero-energy mode, and then analyzing the effect of Majorana zero-energy mode on Josephson current. The expected research results will enrich the research content of graphene-like materials and promote the research and development on graphene-like materials-based topological quantum and superconducting devices with high-performance.