Tailoring Effective Exchange Interactions via Domain Walls in Coupled Heisenberg Rings

TL;DR

This paper demonstrates how domain wall manipulation in coupled antiferromagnetic Heisenberg rings can dynamically control exchange interactions, enabling tunable quantum spin systems with potential applications in quantum information processing.

Contribution

It introduces a theoretical method to modulate exchange interactions in coupled spin rings via domain wall movement, creating tunable quantum spin systems.

Findings

Domain wall movement modulates exchange interactions.

Configurations can induce ferromagnetic coupling.

Potential for constructing tunable quantum spin networks.

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.