• 文献标题:   Promotion of superconductivity in magic-angle graphene multilayers
  • 文献类型:   Article
  • 作  者:   ZHANG YR, POLSKI R, LEWANDOWSKI C, THOMSON A, PENG Y, CHOI Y, KIM H, WATANABE K, TANIGUCHI T, ALICEA J, VON OPPEN F, REFAEL G, NADJPERGE S
  • 作者关键词:  
  • 出版物名称:   SCIENCE
  • ISSN:   0036-8075 EI 1095-9203
  • 通讯作者地址:  
  • 被引频次:   12
  • DOI:   10.1126/science.abn8585
  • 出版年:   2022

▎ 摘  要

Graphene moire 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 moire unit cell. Our results highlight the role of the interplay between flat and more dispersive bands in extending superconducting regions in graphene moire superlattices.