• 文献标题:   Spin-valley coupling in single-electron bilayer graphene quantum dots
  • 文献类型:   Article
  • 作  者:   BANSZERUS L, MOLLER S, STEINER C, ICKING E, TRELLENKAMP S, LENTZ F, WATANABE K, TANIGUCHI T, VOLK C, STAMPFER C
  • 作者关键词:  
  • 出版物名称:   NATURE COMMUNICATIONS
  • ISSN:  
  • 通讯作者地址:  
  • 被引频次:   14
  • DOI:   10.1038/s41467-021-25498-3
  • 出版年:   2021

▎ 摘  要

Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree of freedom in solid-state systems, is central to applications in spin-based electronics and quantum computation. Recent developments in the preparation of electrostatically-confined quantum dots in gapped bilayer graphene (BLG) enable to study the low-energy single-electron spectra in BLG quantum dots, which is crucial for potential spin and spin-valley qubit operations. Here, we present the observation of the spin-valley coupling in bilayer graphene quantum dots in the single-electron regime. By making use of highly-tunable double quantum dot devices we achieve an energy resolution allowing us to resolve the lifting of the fourfold spin and valley degeneracy by a Kane-Mele type spin-orbit coupling of approximate to 60 mu eV. Furthermore, we find an upper limit of a potentially disorder-induced mixing of the K and K' states below 20 mu eV.