Remote spin control in Haldane spin chains
Mesoscale and Nanoscale Physics
2025-09-01 v1
Abstract
We consider the remote manipulation of the quantum state of the edge fractional spins of Haldane spin chains using a weak local perturbation on the other edge. We derive an effective four-level model that correctly captures the response of the local magnetization to local perturbations and we use it to show that applying a small local field on one edge of the chain induces a strong variation of the magnetization on the opposite edge. Using a Landau-Zener protocol, we show how local control of the field on one edge of the chain, implemented for instance with a spin-polarized scanning tunnel microscope tip, can adiabatically switch the magnetization direction on the other side of the chain.
Cite
@article{arxiv.2508.21544,
title = {Remote spin control in Haldane spin chains},
author = {Y. del Castillo and A. Ferrón and J. Fernández-Rossier},
journal= {arXiv preprint arXiv:2508.21544},
year = {2025}
}