Charge density waves in multiple-Q spin states
Charge density waves in multiple-Q spin states
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多Q自旋态的电荷密度波
DOI：
10.1103/physrevb.104.144404
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发表时间：
2021
影响因子：
3.7
通讯作者：
Motome Yukitoshi
中科院分区：
文献类型：
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作者：
Hayami Satoru;Motome Yukitoshi
电子自旋和电荷自由度之间的耦合是固体各种电子和磁性特性的来源。我们从理论上研究了在流动磁体中存在磁有序的情况下由自旋电荷耦合引起的电荷密度波。通过在近藤晶格模型的弱耦合极限下进行微扰计算，我们得出了电荷和自旋密度波之间关系的有用公式，该公式可以应用于任何磁序，包括由多个自旋密度波组成的非共线和非共面磁序，称为多磁序。与数值计算相比，我们展示了对单态和双态（包括方形晶格上的斯格明子和子-反铁离子晶体）的预测能力。此外，我们表明电荷密度波比自旋密度波包含更丰富的信息，并且确实有助于区分具有相似自旋结构因子的自旋纹理。我们从动键能和矢量自旋手性方面讨论了与键调制的关系。我们还进行了微扰范围之外的数值计算，发现当电子填充量相当时，电荷密度波可以增强。此外，我们研究了自旋轨道耦合的影响，由于动量空间中有效的各向异性磁相互作用，这可能导致额外的电荷密度波。我们的结果将提供一种从电荷调制中识别复杂磁序及其起源的方法。
Coupling between spin and charge degrees of freedom in electrons is a source of various electronic and magnetic properties of solids. We theoretically study charge density waves induced by the spin-charge coupling in the presence of magnetic orderings in itinerant magnets. By performing a perturbative calculation in the weak-coupling limit of the Kondo lattice model, we derive a useful formula for the relationship between charge and spin density waves, which can be applied to any magnetic orderings, including noncollinear and noncoplanar ones composed of multiple spin density waves called multiple-magnetic orderings. We demonstrate the predictive power for single-and double-states including skyrmion and meron-antimeron crystals on a square lattice, in comparison with the numerical calculations. Moreover, we show that the charge density waves contain richer information than the spin density waves, and are indeed useful in distinguishing the spin textures with similar spin structure factors. We discuss the relation to bond modulation in terms of the kinetic bond energy and the vector spin chirality. We also perform numerical calculations beyond the perturbative regime and find that the charge density waves can be enhanced when the electron filling is commensurate. Furthermore, we investigate the effect of the spin-orbit coupling, which can lead to additional charge density waves owing to effective anisotropic magnetic interactions in momentum space. Our result will provide a way to identify complex magnetic orderings and their origins from the charge modulations.