Electrical spin manipulation in graphene nanostructures

Article

关键词: QUANTUM DOTS;    WEAK FERROMAGNETISM;    EDGE STATE;    FIELD;    RESONANCE;    ATOMS;    NANORIBBONS;    INFORMATION;    COMPUTATION;    SURFACE;   

DOI  :  10.1103/PhysRevB.97.195425

来源: SCIE

【 摘 要 】

We propose a mechanism to drive singlet-triplet spin transitions electrically in a wide class of graphene nanostructures that present pairs of in-gap zero modes, localized at opposite sublattices. Examples are rectangular nanographenes with short zigzag edges, armchair ribbon heterojunctions with topological in-gap states, and graphene islands with sp(3) functionalization. The interplay between the hybridization of zero modes and the Coulomb repulsion leads to symmetric exchange interaction that favors a singlet ground state. Application of an off-plane electric field to the graphene nanostructure generates an additional Rashba spin-orbit coupling, which results in antisymmetric exchange interaction that mixes S = 0 and S = 1 manifolds. We show that modulation in time of either the off-plane electric field or the applied magnetic field permits performing electrically driven spin resonance in a system with very long spin-relaxation times.

【 授权许可】

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