论文标题
s = 2量子自旋链，具有生物二级交换相互作用
S=2 Quantum Spin Chain with the Biquadratic Exchange Interaction
论文作者
论文摘要
$ s = 2 $量子自旋链带有单离子各向异性$ D $和Biquadratic Exchange交互$ J _ {\ rm BQ} $，使用有限尺寸群集的数值对角度和级别的光谱分析进行了研究。发现与对称性保护拓扑（SPT）相对应的中间$ d $相位出现在基态相图的宽区域中。我们还在包括SPT高原相的饱和磁化的一半处获得了相图。
The $S=2$ quantum spin chain with the single-ion anisotropy $D$ and the biquadratic exchange interaction $J_{\rm BQ}$ is investigated using the numerical diagonalization of finite-size clusters and the level spectroscopy analysis. It is found that the intermediate-$D$ phase corresponding to the symmetry protected topological (SPT) phase appears in a wide region of the ground state phase diagram. We also obtain the phase diagram at the half of the saturation magnetization which includes the SPT plateau phase.
