Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling
Abstract
Several realistic spin-orbital models for transition metal oxides go beyond the classical expectations and could be understood only by employing the quantum entanglement. Experiments on these materials confirm that spin-orbital entanglement has measurable consequences. Here, we capture the essential features of spin-orbital entanglement in complex quantum matter utilizing 1D spin-orbital model which accommodates SU(2)xSU(2) symmetric Kugel-Khomskii superexchange as well as the Ising on-site spin-orbit coupling. Building on the results obtained for full and effective models in the regime of strong spin-orbit coupling, we address the question whether the entanglement found on superexchange bonds always increases when the Ising spin-orbit coupling is added. We show that (i) quantum entanglement is amplified by strong spin-orbit coupling and, surprisingly, (ii) almost classical disentangled states are possible. We complete the latter case by analyzing how the entanglement existing for intermediate values of spin-orbit coupling can disappear for higher values of this coupling.
Cite
@article{arxiv.2009.11773,
title = {Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling},
author = {Dorota Gotfryd and Ekaterina Paerschke and Krzysztof Wohlfeld and Andrzej M. Oles},
journal= {arXiv preprint arXiv:2009.11773},
year = {2020}
}
Comments
Proceedings paper [Quantum Complex Matter Conference, June 2020, Frascati] reporting on the research first presented in Physical Review Research 2, 013353 (2020) [arXiv:1911.12180]