含时轴子场的电磁效应
Electromagnetic effects induced by time-dependent axion field
摘要：
我们研究了所谓的$θ$ -term的动力学，它存在于拓扑材料中，与粒子物理中Peccei-Quinn预测的一个假设场有关，在一个由拓扑绝缘体和两个铁磁绝缘体构成的磁性超晶格中，其中铁磁绝缘体具有垂直的磁各向异性和不同的磁矫顽场。我们研究了一种方法来驱动的动力学的$θ$ -长期在磁性超晶格通过改变反转对称性（从一个反平行到一个平行的磁配置）使用外部磁场。结果，我们发现，非常规的电磁场，这是磁场感应电荷电流，反之亦然，产生的非零动力学的$θ$项。
英文摘要：
We studied the dynamics of the so-called $θ$-term, which exists in topological materials and is related to a hypothetical field predicted by Peccei-Quinn in particle physics, in a magnetic superlattice constructed using a topological insulator and two ferromagnetic insulators, where the ferromagnetic insulators had perpendicular magnetic anisotropies and different magnetic coercive fields. We examined a way to drive the dynamics of the $θ$-term in the magnetic superlattice through changing the inversion symmetry (from an anti-parallel to a parallel magnetic configuration) using an external magnetic field. As a result, we found that unconventional electromagnetic fields, which are magnetic field-induced charge currents and vice versa, are generated by the nonzero dynamics of the $θ$-term.
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