论文标题
Skyrmion晶体，具有整数和分数的天际晶体数，在非晶格晶格结构中带有螺钉轴
Skyrmion crystal with integer and fractional skyrmion numbers in a nonsymmorphic lattice structure with the screw axis
论文作者
论文摘要
用螺钉对称性研究了在非形态晶格系统中磁性天际晶体的出现。通过对具有各向同性交换相互作用的分层自旋模型进行模拟退火，以及反对的dzyaloshinskii-moriya相互作用，然后构建一个低温相图，我们揭示了Skyrmion Crystal在零和非零场中的稳定，即使在没有三倍旋转的情况下，也可以稳定在零和非零场中。我们表明，在螺钉轴存在下，铁电磁层间交换相互作用与层和动量依赖性各向异性相互作用之间的竞争是天空晶体的来源。此外，我们发现两种类型的层依赖性的天际晶体，它们的特征在狭窄的场区域中为Skyrmion晶体和螺旋状态的共存状态。我们的结果提供了参考，以进一步搜索非词法晶格系统中的Skyrmion晶体。
The emergence of a magnetic skyrmion crystal in a nonsymmorphic lattice system with the screw symmetry is numerically investigated. By performing the simulated annealing for a layered spin model with the isotropic exchange interaction and the antisymmetric Dzyaloshinskii-Moriya interaction, and then constructing a low-temperature phase diagram, we reveal that the skyrmion crystal is stabilized in both zero and nonzero fields even without the threefold rotational symmetry in the two-dimensional plane. We show that a competition between the ferromagnetic interlayer exchange interaction and the layer- and momentum-dependent anisotropic interactions is a source of the skyrmion crystals in the presence of the screw axis. Moreover, we find two types of layer-dependent skyrmion crystals, which are characterized as a coexisting state of the skyrmion crystal and the spiral state, in the narrow field region. Our result provides a reference for further search of the skyrmion crystals in nonsymmorphic lattice systems.
