论文标题
时间依赖性应变拓扑镁相变
Time-dependent strain-tuning topological magnon phase transition
论文作者
论文摘要
研究了在时间依赖性菌株的作用下蜂窝状晶格中的线磁铁。鉴于高频定期变化的限制，我们得出了一种有效的自旋系统浮雕理论，从而导致旋转手性的出现。我们发现镁和自旋手性之间的耦合取决于应变的细节，例如空间依赖性和施加方向。确定了有关铁磁状态的镁波动，并发现在空间上均匀的菌株将镁质系统驱动到拓扑保护的相中。特别是，我们表明某些均匀的应变场在平面外的下一个邻居Dzyaloshinskii-Moriya相互作用中起着作用。此外，我们探索了非均匀菌株的应用，这导致了镁的限制，即单轴菌株沿着保留翻译对称性的方向传播。我们的作品展示了一种直接而新颖的方式，可以根据时间依赖性应变工程来操纵磁通光谱，这与探索量子镁中的拓扑过渡有关。
Collinear magnets in honeycomb lattices under the action of time-dependent strains are investigated. Given the limits of high-frequency periodically varying deformations, we derive an effective Floquet theory for spin system that results in the emergence of a spin chirality. We find that the coupling between magnons and spin chirality depends on the details of the strain such as the spatial dependence and applied direction. Magnonic fluctuations about the ferromagnetic state are determined, and it is found that spatially homogeneous strains drive the magnon system into topologically protected phases. In particular, we show that certain uniform strain fields play the role of an out-of-plane next-neighbor Dzyaloshinskii-Moriya interaction. Furthermore, we explore the application of nonuniform strains, which lead to a confinement of magnon states that for uniaxial strains, propagates along the direction that preserves translational symmetry. Our work demonstrates a direct and novel way in which to manipulate the magnon spectrum based on time-dependent strain engineering that is relevant for exploring topological transitions in quantum magnonics.
