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. Here, we report the development of a bulk superlattice consisting of the transition metal dichalcogenide (TMD) superconductor 2H-niobium disulfide (2H-NbS2) and a commensurate block layer that yields dramatically 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.
@article{arxiv.1906.02065,
title = {Clean 2D superconductivity in a bulk van der Waals superlattice},
author = {Aravind Devarakonda and Hisashi Inoue and Shiang Fang and Cigdem Ozsoy-Keskinbora and Takehito Suzuki and Markus Kriener and Liang Fu and Efthimios Kaxiras and David C. Bell and Joseph G. Checkelsky},
journal= {arXiv preprint arXiv:1906.02065},
year = {2020}
}
Comments
Accepted version with revised title, discussion, structure, and figures. 38 pages, 4 figures