Spin-valley coupling in single-electron bilayer graphene quantum dots

• DOI: 10.1038/s41467-021-25498-3
• Publication Date: 2021-09-23T14:32:14Z
• Authors: L. Banszerus; S. Möller; C. Steiner; E. Icking; S. Trellenkamp; F. Lentz; K. Watanabe; T. Taniguchi; C. Volk; C. Stampfer
• Keywords: Bilayer graphene

Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree freedom in solid-state systems central applications spin-based electronics and quantum computation. Recent developments preparation electrostatically-confined dots gapped bilayer graphene (BLG) enables study low-energy single-electron spectra BLG dots, which crucial for potential spin-valley qubit operations. Here, we present observation coupling dot regime. By making use highly-tunable double device achieve an energy resolution allowing us resolve lifting fourfold degeneracy by Kane-Mele type spin-orbit $\approx 65~μ$eV. Also, find upper limit potentially disorder-induced mixing $K$ $K'$ states below $20~μ$eV.