Dynamic axion insulators feature a time-dependent axion field that can be induced by antiferromagnetic resonance. Here, we show that a Josephson junction incorporating this dynamic axion insulator between two superconductors exhibits striking doubled Shapiro steps wherein all odd steps are completely suppressed in the joint presence of a DC bias and a static magnetic field. The resistively shunted junction simulation confirms that these doubled Shapiro steps originate from the distinctive axion electrodynamics driven by the antiferromagnetic resonance, which thus not only furnishes a hallmark to identify the dynamic axion insulator but also provides a method to evaluate its mass term. Furthermore, the experimentally feasible differential conductance is also determined. Our work holds significant importance in condensed matter physics and materials science for understanding the dynamic axion insulator, paving the way for its further exploration and applications.

动态轴子绝缘体具有瞬态轴子场，可由反铁磁共振感应。在这里，我们表明，在两个超导体之间包含这种动态轴子绝缘体的 Josephson 结表现出引人注目的双倍夏皮罗阶跃，其中在直流偏压和静磁场的共同存在下，所有奇数阶跃都被完全抑制。电阻分流结模拟证实，这些双倍的 Shapiro 步骤源于由反铁磁共振驱动的独特轴子电动力学，因此这不仅为识别动态轴子绝缘体提供了标志，而且还提供了一种评估其质量项的方法。此外，还确定了实验上可行的差分电导。我们的工作在凝聚态物理学和材料科学中具有重要意义，有助于理解动态轴子绝缘体，为其进一步探索和应用铺平道路。