We present theoretical results based on mean-field and exact many-body approaches showing that in bilayer triangular graphene quantum dots with zigzag edges the magnetism can be controlled by an external vertical electric-field. We demonstrate that without electric field the spins of the two layers of the quantum dot interact ferromagnetically. At a critical value of the electric-field, the total spin of the bilayer structure can be turned off or reduced to a single localized spin, a qubit isolated from contacts and free from interaction with nuclear spins.
@article{arxiv.1104.3108,
title = {Electric-field controlled spin in bilayer triangular graphene quantum dots},
author = {A. D. Guclu and P. Potasz and P. Hawrylak},
journal= {arXiv preprint arXiv:1104.3108},
year = {2015}
}