Simulating spin-valley locking in the transport spectroscopy of bilayer graphene quantum dots

Spin-valley qubits in 2D-material quantum dots are being actively pursued as platforms for quantum information manipulation. Keeping in mind recent experiments [1-2], we present a detailed simulation of the transport spectroscopy [3] of bilayer graphene single quantum dots, considering the spin-valley physics in detail. Using a first-principles based Hamiltonian, we perform detailed quantum transport simulations of the Coulomb diamonds, in the presence of an arbitrarily aligned magnetic field. Extrapolating from the transport simulations, we establish the occurence of spin-valley locking. Furthermore, we elucidate the role of defects, intra and inter-valley Coulomb interaction on the signatures of spin-valley locking, thereby leading to machine learning ready extrapolation [4] of the associated g-factors.

[1] L. Banszerus et.al., Nat. Comms., 12, 5250 (2021).

[2] R. Krishnan et. al., Nano. Lett., 23, 6171 (2023).

[3] A. Mukherjee and B. Muralidharan, 2D Materials, 10, 035006 (2023).

[4] A. Das et.al., ArXiv: 2308.04937 (2023).