论文标题
SU的线性风味波分析（4） - 对称四聚体模型，人口不平衡
Linear Flavor-Wave Analysis of SU(4)-Symmetric Tetramer Model with Population Imbalance
论文作者
论文摘要
我们研究了Su（4）Mott绝缘子在正方形的超级晶格中的量子磁性，其中具有四个核旋转成分的原子在控制两个组件的种群之间的不平衡和其他两个组件之间的不平衡的情况下，彼此相互作用。这是强磁场下自旋二聚体材料物理学的自然扩展。我们采用基于四个位置纸质的扩展线性波风味理论，并揭示地面相图和激发光谱。当四个组件的种群平衡并且斑块弱耦合时，基态大约由局部su（4）singlet状态的直接乘积给出。在高场中，系统到达仅存在两个组件的“饱和状态”。我们的主要发现是一个非平凡的中间阶段，该阶段具有SU（4） - 单点和四个位点谐振率键状态的棋盘状布置。
We study the quantum magnetism of the SU(4) Mott insulator in a square optical superlattice, in which atoms with four nuclear-spin components strongly interact with each other, in the presence of an external field that controls the imbalance between the population of two components and that of the other two. This is a natural extension of the physics of spin-dimer materials under strong magnetic field. We apply an extended linear flavor-wave theory based on four-site plaquettes and unveil the ground-state phase diagram and excitation spectra. When the population of the four components is balanced and the plaquesttes are weakly coupled, the ground state is approximately given by the direct product of local SU(4)-singlet states. In high-field, the system reaches a "saturated state" where only two components are present. Our main finding is a nontrivial intermediate phase, which has a checkerboard-like arrangement of the SU(4)-singlet and four-site resonating-valence-bond states.
