Clean 2D superconductivity in a bulk van der Waals superlattice.
basic_science · Level V
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- Record sourced from PubMed, PMID 33033221.
- Also identified by DOI 10.1126/science.aaz6643.
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Abstract
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<i>H</i>-niobium disulfide (2<i>H</i>-NbS<sub>2</sub>) 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.