Abstract

Quantum correlation in the spin-1 bilinear–biquadratic model is investigated using the SU(3) flavor-wave formalism. The calculations are performed for the model in the quadrupolar phases. We calculate the von Neumann entropy as a function of the biquadratic couplings \(J_{bq_{\nu }}\), \(\nu =1,2\) and next-nearest-neighboring exchange interactions on square lattice with aim to verify the effect of the different phase transitions, like the transition between nematic phases, on quantum entanglement. Calculations using density matrix renormalization group for the behavior of the concurrence as a function of the biquadratic interaction \(J_{bq_{2}}\) are also presented.

Graphic abstract

中文翻译：

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铁基超导体双线性-双二次模型中的量子相关性

摘要

使用 SU(3) 风味波形式主义研究了自旋 1 双线性双二次模型中的量子相关性。对四极相中的模型进行计算。我们将冯诺依曼熵计算为双二次耦合\(J_{bq_{\nu }}\)、\(\nu =1,2\)和方格上的下一个最近邻交换相互作用的函数，目的是验证不同相变（如向列相之间的转变）对量子纠缠的影响。还介绍了使用密度矩阵重整化群计算并发行为作为双二次相互作用\(J_{bq_{2}}\)的函数。

图形摘要