Superconductivity in 5.0° twisted bilayer WSe2

• 成果类型: Article
• 署名作者: Guo, Yinjie; Pack, Jordan; Swann, Joshua; Holtzman, Luke; Cothrine, Matthew; Watanabe, Kenji; Taniguchi, Takashi; Mandrus, David G.; Barmak, Katayun; Hone, James; Millis, Andrew J.; Pasupathy, Abhay; Dean, Cory R.
• 署名单位: Columbia University; Columbia University; University of Tennessee System; University of Tennessee Knoxville; National Institute for Materials Science; National Institute for Materials Science; United States Department of Energy (DOE); Oak Ridge National Laboratory; Columbia University; Simons Foundation; Flatiron Institute; United States Department of Energy (DOE); Brookhaven National Laboratory
• 刊物名称: Nature
• ISSN/ISSBN: 0028-3644
• DOI: 10.1038/s41586-024-08381-1
• 发表日期: 2025-01-23
• 关键词: states; graphene; heterostructures

摘要

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 moir & eacute; superlattice that gives rise to low-energy flat bands with strong correlations6. Flat bands can also be induced by moir & eacute; 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 moir & eacute; 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 degrees 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 moir & eacute; 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 structures.