Probing TwoElectron Multiplets in Bilayer Graphene Quantum Dots
Abstract
We report on finite bias spectroscopy measurements of the twoelectron 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 ≈ 0.4  0.8 meV from orbital antisymmetric states. The symmetric multiplet exhibits an additional energy splitting of its six 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 intervalley scattering and "currentcurrent" interaction constants are of the same magnitude in BLG.
 Publication:

Physical Review Letters
 Pub Date:
 December 2021
 DOI:
 10.1103/PhysRevLett.127.256802
 arXiv:
 arXiv:2106.08405
 Bibcode:
 2021PhRvL.127y6802M
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 6 pages, 3 figures