论文标题
中心对称系统中具有局部倒置 - 对称层的方形天际晶体
Square skyrmion crystal in centrosymmetric systems with locally inversion-asymmetric layers
论文作者
论文摘要
我们研究了中心对称分层系统中磁性天空的方形形成的不稳定性。通过专注于双层平方晶格结构，其倒置中心在层间键而不是原子位点上，我们根据有效的自旋模型，通过模拟的退火来检查基于有动量的固定态相互作用的有效旋转模型。结果，我们发现建立在晶格结构中的依赖层的交错的dzyaloshinskii-moriya相互作用成为外部磁场中方形天际晶体的起源，而与中间层交换相互作用的迹象无关。所获得的方形天际晶体由由于交错的dzyaloshinskii-moriya相互作用而由天空晶体组成，每层均具有不同的螺旋晶体。此外，我们表明，交错的dzyaloshinskii-moriya相互作用与层间交换相互作用之间的相互作用会导致低田间区域标量的手性均匀分量的双$ q $状态。目前的结果提供了一种稳定中心对称磁铁中方形天际晶体的另一种方法，这对于探索进一步的外来拓扑自旋纹理非常有用。
We investigate an instability toward a square-lattice formation of magnetic skyrmions in centrosymmetric layered systems. By focusing on a bilayer square-lattice structure with the inversion center at the interlayer bond instead of the atomic site, we numerically examine the stability of the square skyrmion crystal based on an effective spin model with the momentum-resolved interaction in the ground state through the simulated annealing. As a result, we find that a layer-dependent staggered Dzyaloshinskii-Moriya interaction built in the lattice structure becomes the origin of the square skyrmion crystal in an external magnetic field irrespective of the sign of the interlayer exchange interaction. The obtained square skyrmion crystal is constituted of the skyrmion crystals with different helicities in each layer due to the staggered Dzyaloshinskii-Moriya interaction. Furthermore, we show that the interplay between the staggered Dzyaloshinskii-Moriya interaction and the interlayer exchange interaction gives rise to a double-$Q$ state with a uniform component of the scalar chirality in the low-field region. The present results provide another way of stabilizing the square skyrmion crystal in centrosymmetric magnets, which will be useful to explore further exotic topological spin textures.
