论文标题
限制多体伯特弦
Confinement of many-body Bethe strings
论文作者
论文摘要
基于Bethe-Ansatz方法和非弹性中子散射实验，我们揭示了多体Bethe字符串在准二维抗Fiferromagnet $ \ rm ybalo_3 $中的限制的演变。在抗铁磁阶段，自旋动力学以限长的长度为1伯特弦主导，当材料调谐到旋转密度波相时，激发光谱的高能量分支的支配性会屈服于牢固的长度-2 bethe strings。在热诱导的无序区域中，限制效应消失，系统恢复了一维海森伯格模型的常规量子整合物理。我们的结果建立了基于$ \ rm ybalo_3 $不同磁性阶段的自旋动力学的Bethe弦的统一图片，从而为多体量子磁性提供了深刻的见解。
Based on Bethe-ansatz approach and inelastic neutron scattering experiments, we reveal evolution of confinement of many-body Bethe strings in ordered regions of quasi-one-dimensional antiferromagnet $\rm YbAlO_3$. In the antiferromagnetic phase, the spin dynamics is dominated by the confined length-1 Bethe strings, whose dominancy in the high-energy branch of the excitation spectrum yields to the confined length-2 Bethe strings when the material is tuned to the spin-density-wave phase. In the thermal-induced disordered region, the confinement effect disappears, and the system restores the conventional quantum integrable physics of the one-dimensional Heisenberg model. Our results establish a unified picture based on Bethe string for the spin dynamics in different magnetic phases of $\rm YbAlO_3$, and thus provide profound insight into the many-body quantum magnetism.
