Probing two-electron multiplets in bilayer graphene quantum dots

S Moller, Luca Banszerus, A. Knothe, C. Steiner, E. Icking, S. Trellenkamp, F. Lentz, K. Watanabe, T Taniguchi, Leonid I. Glazman, Vladimir Fal'ko, C. Volk, Christoph Stampfer

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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 6 orbital symmetric and 10 orbital anti-symmetric states. We find that orbital symmetric states are lower in energy and separated by ≈ 0.4 − 0.8 meV from orbital anti-symmetric states. The symmetric multiplet exhibits an additional energy splitting of its 6 states of ≈ 0.15 − 0.5 meV due to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that inter-valley scattering and ’current-current’ interaction constants are of the same magnitude in BLG
Original languageEnglish
JournalPhysical Review Letters
Early online date15 Dec 2021
Publication statusPublished - 15 Dec 2021

Research Beacons, Institutes and Platforms

  • National Graphene Institute


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