Electric-Field-Induced Spin Resonance in Antiferromagnetic Insulators: Inverse Process of the Dynamical Chiral Magnetic Effect

We propose a realization of the electric-field-induced antiferromagnetic resonance. We consider three-dimensional antiferromagnetic insulators with spin-orbit coupling characterized by the existence of a topological term called the $\theta$ term. By solving the Landau-Lifshitz-Gilbert equation in the presence of the $\theta$ term, we show that, in contrast to conventional methods using ac magnetic fields, the antiferromagnetic resonance state is realized by ac electric fields along with static magnetic fields. This mechanism can be understood as the inverse process of the dynamical chiral magnetic effect, an alternating current generation by magnetic fields. In other words, we propose a way to electrically induce the dynamical axion field in condensed matter. We discuss a possible experiment to observe our proposal, which utilizes the spin pumping from the antiferromagnetic insulator into a heavy metal contact.

我们提出一种电场诱导的反铁磁共振的实现方法。我们考虑具有自旋 - 轨道耦合的三维反铁磁绝缘体，其特征是存在一个被称为$\theta$项的拓扑项。通过在存在$\theta$项的情况下求解朗道 - 栗弗席兹 - 吉尔伯特方程，我们表明，与使用交流磁场的常规方法不同，反铁磁共振态是由交流电场以及静磁场实现的。这种机制可以理解为动态手性磁效应的逆过程，即磁场产生交流电。换句话说，我们提出了一种在凝聚态物质中电诱导动态轴子场的方法。我们讨论了一个可能的实验来验证我们的提议，该实验利用从反铁磁绝缘体到重金属接触的自旋泵浦。