论文标题
狄拉克半法的轴向磁电效应
Axial Magnetoelectric Effect in Dirac semimetals
论文作者
论文摘要
我们提出了一种通过{\ em轴向磁电效应}（AMEE）产生静态磁化的机制。磁化$ {\ bf m} \ sim {\ bf e} _5（ω）\ times {\ bf e} _5^{*}（ω）$出现，这是由于轴向电场的角动量转移的结果是轴向电场的角动量$ {\ bf e} _5（\ bf e} _5（t）$ _5（t）$ _5（t）我们指出拟议的AMEE与常规的Faraday效应（IFE）之间的相似性和差异。例如，我们估计了由圆形极化的声波产生的AMEE，并发现它在Gigahertz频率声音的微果石尺度上。与常规的IFE相反，磁化强度在小频率和固定的声音强度上线性上升，并且展示了AMEE的非单调峰行为。该效果提供了一种通过常规磁力测定技术研究异常轴向电磁场的方法。
We propose a mechanism to generate a static magnetization via {\em axial magnetoelectric effect} (AMEE). Magnetization ${\bf M} \sim {\bf E}_5(ω)\times {\bf E}_5^{*}(ω)$ appears as a result of the transfer of the angular momentum of the axial electric field ${\bf E}_5(t)$ into the magnetic moment in Dirac and Weyl semimetals. We point out similarities and differences between the proposed AMEE and a conventional inverse Faraday effect (IFE). As an example, we estimated the AMEE generated by circularly polarized acoustic waves and find it to be on the scale of microgauss for gigahertz frequency sound. In contrast to a conventional IFE, magnetization rises linearly at small frequencies and fixed sound intensity as well as demonstrates a nonmonotonic peak behavior for the AMEE. The effect provides a way to investigate unusual axial electromagnetic fields via conventional magnetometry techniques.
