Axion Instability and Nonlinear Electromagnetic Effect
Axion Instability and Nonlinear Electromagnetic Effect
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DOI：
10.7566/jpsj.88.024402
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发表时间：
2019-02-15
影响因子：
1.7
通讯作者：
Sato, Masatoshi
中科院分区：
文献类型：
--
作者：
Imaeda, Tatsushi;Kawaguchi, Yuki;Sato, Masatoshi
我们研究了绝缘体拓扑相变附近动态轴子场引起的不稳定性。我们首先指出，动态轴子场的幅度通常对于磁绝缘体来说是有界的，这抑制了轴子的不稳定性。然而，在拓扑相变附近，轴子场可能会出现较大的波动，从而降低了不稳定的临界电场并增加了轴子感应磁通密度。在两种不同模型哈密顿量的基础上，我们详细报告了轴子场的电磁响应。
We investigate the instability caused by the dynamical axion field near the topological phase transition of insulators. We first point out that the amplitude of the dynamical axion field is bounded for magnetic insulators in general, which suppresses the axion instability. Near the topological phase transition, however, the axion field may have a large fluctuation, which decreases the critical electric field for the instability and increases the axion induced magnetic flux density. On the basis of two different model Hamiltonians, we report the electromagnetic response of the axion field in detail.