论文标题
在三角晶格上的近野晶格模型中的照片诱导的120度自旋顺序
Photoinduced 120-degree spin order in the Kondo-lattice model on a triangular lattice
论文作者
论文摘要
从理论上讲，我们在三角形晶格上的光电疗法的Kondo-rattice模型中预测了120度自旋顺序作为非平衡稳态的出现。在系统中，从半半磁性基态填充，传导电子的光激发和带宽的光诱导的重新归一化会导致频带结构的重建以及随后通过放松对电子的重新分布，从而使电子结构在Equilibrium处类似于电子结构，在Equilibrium处类似于该电子结构，在该均衡系统中均为120度无用的旋转均可稳定。在这个照片诱导的120度旋转顺序相位，形成了不同自旋顺序的域，并在多个域相遇的点出现了称为$ z_2 $涡流的自旋手性向量的涡旋。我们还讨论了通过研究对光参数（振幅，频率和极化）的依赖性，电子填充，近托耦合的强度以及局部脊柱中抗毒素磁偶联的影响，讨论了观察预测的光诱导磁相变的实验性的可行性。到目前为止提出的光诱导的磁性结构仅限于简单的共线（反）铁磁阶或磁体中的局部磁缺陷。目前的工作铺平了一种方法，可以将复杂的非共线性磁性作为光电系统中的全局非平衡稳定相。
We theoretically predict the emergence of 120-degree spin order as a nonequilibrium steady state in the photodriven Kondo-lattice model on a triangular lattice. In the system away from the half filling with ferromagnetic ground state, the photoexcitation of conduction electrons and the photoinduced renormalization of bandwidth cause reconstruction of band structure and subsequent redistribution of the electrons through relaxations, which result in an electronic structure similar to that in the half-filled system at equilibrium, where the 120-degree spin order is stabilized. In this photoinduced 120-degree spin ordered phase, domains of different spin-ordered planes are formed, and vortices of spin chirality vectors called $Z_2$ vortices appear at points where multiple domains meet. We also discuss favorable conditions and experimental feasibility to observe the predicted photoinduced magnetic phase transition by investigating dependencies on the light parameters (amplitude, frequency, and polarization), the electron filling, the strength of Kondo coupling, and the effects of antiferromagnetic coupling among the localized spins. Photoinduced magnetic structures proposed so far have been limited to simple collinear (anti)ferromagnetic orders or local magnetic defects in magnets. The present work paves a way to optical creation of complex noncollinear magnetisms as global nonequilibrium steady phase in photodriven systems.
