论文标题
旋转轨道纠缠的演变，随着ISIS自旋轨道耦合的增加
Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling
论文作者
论文摘要
过渡金属氧化物的几种逼真的自旋轨道模型超出了经典的期望，只能通过使用量子纠缠才能理解。这些材料的实验证实，旋转轨道纠缠具有可测量的后果。在这里，我们利用1D旋转轨道模型捕获了复杂量子物质中自旋轨道纠缠的基本特征，该模型可容纳SU（2）XSU（2）对称的Kugel-khomskii superexchange以及Ising iSing on site OnIte spin-Orbit旋转耦合。基于在强旋轨耦合方面获得的完整有效模型获得的结果，我们解决了一个问题，当添加Ising旋转轨道耦合时，在superexchange键上发现的纠缠是否总是增加。我们表明（i）量子纠缠通过强旋轨耦合而放大，而且（ii）几乎是经典的分离状态是可能的。我们通过分析如何以较高的耦合值来消失，我们通过分析如何消失的自旋轨耦合中间值的纠缠如何完成后一种情况。
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.
