• 文献标题:   Emergence of correlations in alternating twist quadrilayer graphene
  • 文献类型:   Article
  • 作  者:   BURG GW, KHALAF E, WANG YM, WATANABE K, TANIGUCHI T, TUTUC E
  • 作者关键词:  
  • 出版物名称:   NATURE MATERIALS
  • ISSN:   1476-1122 EI 1476-4660
  • 通讯作者地址:  
  • 被引频次:   9
  • DOI:   10.1038/s41563-022-01286-2 EA JUL 2022
  • 出版年:   2022

▎ 摘  要

Alternating twist multilayer graphene (ATMG) has recently emerged as a family of moire systems that share several fundamental properties with twisted bilayer graphene, and are expected to host similarly strong electron-electron interactions near the magic angle. Here, we study alternating twist quadrilayer graphene (ATQG) samples with twist angles of 1.96 degrees and 1.52 degrees, which are slightly removed from the magic angle of 1.68 degrees. At the larger angle, we find signatures of correlated insulators only when the ATQG is hole doped, and no signatures of superconductivity, and for the smaller angle we find evidence of superconductivity, while signs of the correlated insulators weaken. Our results provide insight into the twist angle dependence of correlated phases in ATMG and shed light on the nature of correlations in the intermediate coupling regime at the edge of the magic angle range where dispersion and interaction are of the same order. The twist angle dependence of correlations in alternating twist quadrilayer graphene is reported.