Superconductivity in 5.0° twisted bilayer WSe2

作者：Yin-Jie Guo, Jordan Pack, Joshua Swann, Luke Holtzman, Matthew Cothrine, Kenji Watanabe, T. Taniguchi, David G. Mandrus, Katayun Barmak, James Hone, Andrew J. Millis, Abhay Pasupathy, Cory R. Dean · 发表于：Nature · 年份：2024 · DOI：10.1038/s41586-024-08381-1 · 被引用次数：234 · 研究领域：Medicine、Physics

The discovery of superconductivity in twisted bilayer and trilayer graphene1, 2, 3, 4–5 has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations6. Flat bands can also be induced by moiré patterns in lattice-mismatched and/or twisted heterostructures of other two-dimensional materials, such as transition metal dichalcogenides (TMDs)7,8. Although a wide range of correlated phenomena have indeed been observed in moiré TMDs9, 10, 11, 12, 13, 14, 15, 16, 17, 18–19, robust demonstration of superconductivity has remained absent9. Here we report superconductivity in 5.0° twisted bilayer WSe2 with a maximum critical temperature of 426 mK. The superconducting state appears in a limited region of displacement field and density that is adjacent to a metallic state with a Fermi surface reconstruction believed to arise from AFM order20. A sharp boundary is observed between the superconducting and magnetic phases at low temperature, reminiscent of spin fluctuation-mediated superconductivity21. Our results establish that moiré flat-band superconductivity extends beyond graphene structures. Material properties that are absent in graphene but intrinsic among TMDs, such as a native band gap, large spin–orbit coupling, spin-valley locking and magnetism, offer the possibility of accessing a broader superconducting parameter space than graphene-only stru...