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作者机构:Departamento de Física Aplicada Universidad de Alicante 03690 Spain QuantaLab International Iberian Nanotechnology Laboratory (INL) Avenida Mestre José Veiga 4715-330 Braga Portugal Institute for Theoretical Physics ETH Zurich 8093 Zurich Switzerland
出 版 物:《Physical Review B》 (Phys. Rev. B)
年 卷 期:2018年第97卷第19期
页 面:195425-195425页
核心收录:
基 金:European Regional Development Fund, FEDER Fundació Catalana de Trasplantament, FCT, (PTDC/FIS-NAN/4662/2014, PTDC/FIS-NAN/3668/2014) MINECO-Spain, (MAT2016-78625-C2) Seventh Framework Programme, FP7, (607904)
主 题:Rashba coupling Spin-orbit coupling Spintronics Graphene Nanostructures Hubbard model Tight-binding model
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 sp3 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.