Electrical spin manipulation in graphene nanostructures

Abstract

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 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 to perform electrically driven spin resonance in a system with very long spin relaxation times.

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• Theory of intermolecular exchange in coupled spin-1/2 nanographenes
• Probing local moments in nanographenes with electron tunneling spectroscopy
• Broken-symmetry magnetic phases in two-dimensional triangulene crystals
• Magnetic frustration and fractionalization in oligo(indenoindenes)
• Topological junction states in graphene nanoribbons: A route to topological chemistry
• Kondo effect due to a hydrogen impurity in graphene: a multichannel Kondo problem with diverging hybridization
• Designer fermion models in functionalized graphene bilayers
• Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet
• Inducing a topological transition in graphene nanoribbons superlattices by external strain
• Ultra-Fast All-Electrical Universal Nano-Qubits
• From Cyclic Nanorings to Single-Walled Carbon Nanotubes: Disclosing the Evolution of their Electronic Structure with the Help of Theoretical Methods