Electric-field controlled spin in bilayer triangular graphene quantum dots
arXiv:1104.3108 · doi:10.1103/PhysRevB.84.035425
Abstract
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.
4 pages, 5 figures
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- Electro-absorption of silicene and bilayer graphene quantum dots
- Fractals of graphene quantum dots in photoluminescence of shungite
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- Externally controlled selective spin transfer through a two-terminal bridge setup
- Quantum simulator of extended bipartite Hubbard model with broken sublattice symmetry: magnetism, correlations, and phase transitions