Topologically nontrivial magnonic solitons
Topologically nontrivial magnonic solitons
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拓扑非平凡磁孤子
DOI：
10.1103/physrevb.99.134402
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发表时间：
2019
影响因子：
3.7
通讯作者：
Bauer Gerrit E. W.
中科院分区：
文献类型：
--
作者：
Elyasi Mehrdad;Sato Koji;Bauer Gerrit E. W.
凝聚态系统中自旋动力学的内在非线性产生了丰富的现象学，可以强烈地受到拓扑结构的影响。在这里，我们研究形成的磁振子孤子的拓扑非平凡的带隙的自旋晶格实现的Haldron模型，在静态和动态（Floquet）制度。我们考虑由磁晶各向异性和磁振子-磁振子相互作用引起的非线性。我们发现孤子形成的功率阈值作为各向异性系数和相互作用强度的函数。我们预测不同类别的拓扑孤子为相同的拓扑类的基础晶格，并解释它从一个拓扑非平凡的质量到平凡的一个过渡。我们的研究结果意味着孤子可以相位分离，包含拓扑平凡和非平凡相位之间的边界，这与消失的自旋波隙有关。
The intrinsic nonlinearities of the spin dynamics in condensed matter systems give rise to a rich phenomenology that can be strongly affected by topology. Here, we study formation of magnonic solitons in the topologically nontrivial band gap of a spin lattice realization of the Haldane model, in both static and dynamic (Floquet) regimes. We consider nonlinearities caused by magnetic crystalline anisotropy and magnon-magnon interactions. We find soliton formation power thresholds as a function of anisotropy coefficient and interaction strength. We predict different classes of topological solitons for the same topological class of the underlying lattice and explain it in terms of a transition from a topologically nontrivial mass to a trivial one. Our findings imply that a soliton can phase separate, containing boundaries between topologically trivial and nontrivial phases, which is associated with a vanishing spin-wave gap.