Electric-field controlled spin in bilayer triangular graphene quantum dots

Details Electric-field controlled spin in bilayer triangular graphene quantum dots Electric-field controlled spin in bilayer triangular graphene quantum dots

2011-04-15

arxiv.org/abs/1104.3108v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

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.

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