Electronic chiralization as an indicator of the anomalous Hall effect in unconventional magnetic systems
Electronic chiralization as an indicator of the anomalous Hall effect in unconventional magnetic systems
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DOI：
10.1103/physrevb.106.024421
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发表时间：
2022-02
影响因子：
3.7
通讯作者：
Hua Chen
中科院分区：
文献类型：
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作者：
Hua Chen
在对称性允许的条件下，某些反铁磁金属中会出现反常霍尔效应。由于这种异常霍尔反铁磁体的净磁化强度通常很小，因此具有与后者具有相同对称性并且可以方便地测量和计算的AHE的其他物理指标是有用的。在这里，我们提出这样的指标命名为电子手性（EC），这是利用一般周期性晶体中的自旋和电荷密度的空间梯度，并可以直接测量散射实验。这种结构特别揭示了磁荷在净磁化消失的非常规磁系统中的AHE中的重要作用。在EC的指导下，我们给出了两个例子的AHE时，磁荷是明确存在的：一个最小的蜂窝模型的灵感来自磁荷有序相的戈薇自旋冰，和斜散射的二维狄拉克电子的磁荷。
The anomalous Hall effect (AHE) can appear in certain antiferromagnetic metals when it is allowed by symmetry. Since the net magnetization is usually small in such anomalous Hall antiferromagnets, it is useful to have other physical indicators of the AHE that have the same symmetry properties as the latter and can be conveniently measured and calculated. Here we propose such indicators named as electronic chiralization (EC), which are constructed using spatial gradients of spin and charge densities in general periodic crystals, and can potentially be measured directly by scattering experiments. Such constructions particularly reveal the important role of magnetic charge in the AHE in unconventional magnetic systems with vanishing net magnetization. Guided by the EC we give two examples of the AHE when magnetic charge is explicitly present: A minimum honeycomb model inspired by the magnetic-charge-ordered phase of kagome spin ice, and skew scattering of two-dimensional Dirac electrons by magnetic charge.