Tailoring Effective Exchange Interactions via Domain Walls in Coupled Heisenberg Rings

Abstract

The nature of the exchange coupling variation in an antiferromagnetic spin-1/2 system can be used to tailor its ground-state properties. In particular, dimerized Heisenberg rings containing domain walls have localized states which can serve as "flying spin qubits" when the domain walls are moved. We show theoretically that, when two of these rings are coupled, the movement of the domain walls leads to modulation of the effective exchange interaction between the qubits. Appropriately chosen configurations of domain walls can give rise to ferromagnetic effective exchange. We describe how these spin rings may be used as basic building blocks to construct quantum spin systems whose properties are tunable by virtue of the exchange variation within the rings.

30 pages, 9 figures

References in corpus (3)

• Spin-Electric Coupling in Molecular Magnets
• Efficient multiqubit entanglement via a spin-bus
• Effective quantum dimer model for trimerized kagome antiferromagnet

Cited by in corpus (6)

• Electrically-protected resonant exchange qubits in triple quantum dots
• Spin electric effects in molecular antiferromagnets
• Entangling distant resonant exchange qubits via circuit quantum electrodynamics
• Two-Qubit Gates for Resonant Exchange Qubits
• Quantum circuits based on coded qubits encoded in chirality of electron spin complexes in triple quantum dots
• Two-qubit logical operations in three quantum dots system