论文标题
非铁量量子自旋系统中的动态磁化
Dynamic magnetization in non-Hermitian quantum spin system
论文作者
论文摘要
我们报告了与自旋交换相互作用有关的局部复合场引起的全局效应。高阶特殊点至（$ n+1 $） - 在应用于$ n $ size Quantum Spin链的关键本地复杂场上创建水平合并。 （$ n+1 $） - 订单合并水平是各向同性旋转系统中饱和的铁磁基态。值得注意的是，最终状态总是以任何数量的自旋翻转而接近基础状态。即使初始状态与基态正交。此外，宏观磁化强度的开关仅由时间驱动，并在时域形成磁滞回路。滞后环的保留性和矫正性主要依赖于非热性。我们的发现突出了非热性的合作和量子自旋系统中的相互作用，提出了一个动态框架来实现磁化，从而为非富尔米特量子自旋系统铺平了道路。
We report a global effect induced by the local complex field, associated with the spin-exchange interaction. High-order exceptional point up to ($N+1$)-level coalescence is created at the critical local complex field applied to the $N$-size quantum spin chain. The ($N+1$)-order coalescent level is a saturated ferromagnetic ground state in the isotropic spin system. Remarkably, the final state always approaches the ground state for an arbitrary initial state with any number of spin flips; even if the initial state is orthogonal to the ground state. Furthermore, the switch of macroscopic magnetization is solely driven by the time and forms a hysteresis loop in the time domain. The retentivity and coercivity of the hysteresis loop mainly rely on the non-Hermiticity. Our findings highlight the cooperation of non-Hermiticity and the interaction in quantum spin system, suggest a dynamical framework to realize magnetization, and thus pave the way for the non-Hermitian quantum spin system.
