• 文献标题:   Probing Two-Electron Multiplets in Bilayer Graphene Quantum Dots
  • 文献类型:   Article
  • 作  者:   MOLLER S, BANSZERUS L, KNOTHE A, STEINER C, ICKING E, TRELLENKAMP S, LENTZ F, WATANABE K, TANIGUCHI T, GLAZMAN LI, FAL KO VI, VOLK C, STAMPFER C
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:  
  • 被引频次:   6
  • DOI:   10.1103/PhysRevLett.127.256802
  • 出版年:   2021

▎ 摘  要

We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of six orbital symmetric and ten orbital antisymmetric states. We find that orbital symmetric states are lower in energy and separated by approximate to 0.4-0.8 meV from orbital antisymmetric states. The symmetric multiplet exhibits an additional energy splitting of its six states of approximate to 0.15-0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that intervalley scattering and "current-current" interaction constants are of the same magnitude in BLG.