Clean 2D superconductivity in a bulk van der Waals superlattice

• DOI: 10.1126/science.aaz6643
• Publication Date: 2020-10-16T19:50:21Z
• Authors: A. Devarakonda; H. Inoue; S. Fang; C. Ozsoy-Keskinbora; T. Suzuki; M. Kriener; L. Fu; E. Kaxiras; D. C. Bell; J. G. Checkelsky
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Superconductivity; FOS: Physical sciences

Advances in low-dimensional superconductivity are often realized through improvements material quality. Apart from a small group of organic materials, there is near absence clean-limit two-dimensional (2D) superconductors, which presents an impediment to the pursuit numerous long-standing predictions for exotic with fragile pairing symmetries. Here, we report development bulk superlattice consisting transition metal dichalcogenide (TMD) superconductor 2$H$-niobium disulfide (2$H$-NbS$_2$) and commensurate block layer that yields dramatically enhanced two-dimensionality, high electronic quality, inorganic 2D superconductivity. The structure this may naturally be extended generate distinct family topological insulators, excitonic systems based on TMDs improved properties.