Nonlinear dynamics of the topological helicity wave in a frustrated skyrmion string
Nonlinear dynamics of the topological helicity wave in a frustrated skyrmion string
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DOI：
10.1103/physrevb.106.054414
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发表时间：
2022-03
影响因子：
3.7
通讯作者：
J. Xia;Xichao Zhang;Xiaoxi Liu;Yan Zhou;M. Ezawa
中科院分区：
文献类型：
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作者：
J. Xia;Xichao Zhang;Xiaoxi Liu;Yan Zhou;M. Ezawa
挫挫磁系统中的Skyrmion具有螺旋度自由度。由于层间的交换耦合，在层阻挫系统中形成了一个skyrmion弦，该弦可以用XY模型很好地描述。我们考虑一个系统，其中层间交换耦合是交替的，二聚XY模型是具体化的，其线性极限是Su-Schrieffer-Heeger模型。我们认为它是一个非线性拓扑系统。在最底层Skyrmion的螺旋度旋转的初始条件下，我们研究了螺旋度波的猝灭动力学。它产生一个很好的信号，以检测系统是拓扑的还是平凡的。结果表明，在调制交换耦合系统中，Skyrmion弦的螺旋度动力学具有丰富的物理意义。
A skyrmion in frustrated magnetic system has the helicity degree of freedom. A skyrmion string is formed in a frustrated layered system, which is well described by the XY model owing to the exchange coupling between adjacent layers. We consider a system where the interlayer exchange couplings are alternating, where the dimerized XY model is materialized, whose linear limit is the Su-Schrieffer-Heeger model. We argue that it is a nonlinear topological system. We study the quench dynamics of the helicity wave under the initial condition that the helicity of the skyrmion in the bottommost layer is rotated. It yields a good signal to detect whether the system is topological or trivial. Our results show that the helicity dynamics of the skyrmion string have a rich physics in the modulated exchange-coupled system.