Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Science. 2020 Oct 9;370(6513):231-236. doi: 10.1126/science.aaz6643.
Advances in low-dimensional superconductivity are often realized through improvements in material quality. Apart from a small group of organic materials, there is a near absence of clean-limit two-dimensional (2D) superconductors, which presents an impediment to the pursuit of numerous long-standing predictions for exotic superconductivity with fragile pairing symmetries. We developed a bulk superlattice consisting of the transition metal dichalcogenide (TMD) superconductor 2-niobium disulfide (2-NbS) and a commensurate block layer that yields enhanced two-dimensionality, high electronic quality, and clean-limit inorganic 2D superconductivity. The structure of this material may naturally be extended to generate a distinct family of 2D superconductors, topological insulators, and excitonic systems based on TMDs with improved material properties.
低维超导的进展通常通过改善材料质量来实现。除了一小部分有机材料外，几乎没有纯净极限的二维（2D）超导体，这对追求许多具有脆弱配对对称性的奇异超导性的长期预测构成了障碍。我们开发了一种由过渡金属二硫属化物（TMD）超导体 2-二硫化二铌（2-NbS）和一个共形块层组成的体超晶格，该超晶格具有增强的二维性、高电子质量和纯净极限的无机 2D 超导性。这种材料的结构可以自然扩展，以生成基于 TMD 的具有改进材料性能的二维超导体、拓扑绝缘体和激子系统的独特家族。
