• 文献标题:   Nematicity and competing orders in superconducting magic-angle graphene
  • 文献类型:   Article
  • 作  者:   CAO Y, RODANLEGRAIN D, PARK JM, YUAN NFQ, WATANABE K, TANIGUCHI T, FERNANDES RM, FU L, JARILLOHERRERO P
  • 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:   143
  • DOI:   10.1126/science.abc2836
  • 出版年:   2021

▎ 摘  要

Strongly interacting electrons in solid-state systems often display multiple broken symmetries in the ground state. The interplay between different order parameters can give rise to a rich phase diagram. We report on the identification of intertwined phases with broken rotational symmetry in magic-angle twisted bilayer graphene (TBG). Using transverse resistance measurements, we find a strongly anisotropic phase located in a "wedge" above the underdoped region of the superconducting dome. Upon its crossing with the superconducting dome, a reduction of the critical temperature is observed. Furthermore, the superconducting state exhibits an anisotropic response to a direction-dependent in-plane magnetic field, revealing nematic ordering across the entire superconducting dome. These results indicate that nematic fluctuations might play an important role in the low-temperature phases of magic-angle TBG.