Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling
Open Access
- 26 August 2020
- journal article
- research article
- Published by MDPI AG in Condensed Matter
- Vol. 5 (3), 53
- https://doi.org/10.3390/condmat5030053
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)⊗SU(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.Keywords
Funding Information
- Narodowe Centrum Nauki (2016/23/B/ST3/00839 and 2016/22/E/ST3/00560)
- Horizon 2020 (Maria Sk\l{}odowska-Curie grant agreement No. 754411)
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