论文标题
基于双线性和二级旋转跨产品的中心对称多重Q $磁铁中的反对称自旋极化的机理
Mechanism of antisymmetric spin polarization in centrosymmetric multiple-$Q$ magnets based on bilinear and biquadratic spin cross products
论文作者
论文摘要
我们研究了如何在中心对称系统中使用有限的订购波向量在旋转密度波下进行的反对称自旋切割带结构，而无需相对论自旋轨道耦合。根据中心对称静脉磁体中自旋荷尔格耦合模型的扰动分析，我们表明，在磁性顺序下，在动量空间中，非零的手性型双线性和生物质量自旋跨产物与电子带中的抗对称性自旋相关。我们将派生的公式应用于单$ Q $ cycoilal螺旋和双$ Q $ noncoplanar状态，包括Meron-Antimeron和Skyrmion Crystals。我们的结果提出了一个线索，可以实现由中心对称晶格结构中的磁相变向而没有自旋轨道耦合的巨大反对称自旋分裂。
We investigate how to engineer an antisymmetric spin-split band structure under spin density waves with finite ordering wave vectors in centrosymmetric systems without the relativistic spin-orbit coupling. On the basis of a perturbative analysis for the spin-charge coupled model in centrosymmetric itinerant magnets, we show that nonzero chiral-type bilinear and biquadratic spin cross products in momentum space under the magnetic orderings are related to an antisymmetric spin polarization in the electronic band structure. We apply the derived formula to the single-$Q$ cycloidal spiral and double-$Q$ noncoplanar states including the meron-antimeron and skyrmion crystals. Our results present a clue to realize a giant antisymmetric spin splitting driven by magnetic phase transitions in the centrosymmetric lattice structures without the spin-orbit coupling.
