Graphene moiré superlattices show an abundance of correlated insulating, topological, and superconducting phases. Whereas the origins of strong correlations and nontrivial topology can be directly linked to flat bands, the nature of superconductivity remains enigmatic. We demonstrate that magic-angle devices made of twisted tri-, quadri-, and pentalayer graphene placed on monolayer tungsten diselenide exhibit flavor polarization and superconductivity. We also observe insulating states in the tril- and quadrilayer arising at finite electric displacement fields. As the number of layers increases, superconductivity emerges over an enhanced filling-factor range, and in the pentalayer it extends well beyond the filling of four electrons per moiré unit cell. Our results highlight the role of the interplay between flat and more dispersive bands in extending superconducting regions in graphene moiré superlattices.

中文翻译：

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促进魔角石墨烯多层膜的超导性

石墨烯莫尔超晶格显示出大量相关的绝缘相、拓扑相和超导相。尽管强相关性和非平凡拓扑的起源可以直接与平带联系起来，但超导的性质仍然是个谜。我们证明了由扭曲的三层、四层和五层石墨烯制成的魔角器件放置在单层二硒化钨上，表现出风味极化和超导性。我们还观察到在有限电位移场中出现的三层和四层中的绝缘状态。随着层数的增加，超导性出现在增强的填充因子范围内，并且在五层中，它远远超出了每个莫尔晶胞的四个电子的填充。