用时空晶体合成轴子响应
Synthetic Axion Response with Spacetime Crystals
摘要：
在这里，我们表明，时空调制提供了一个令人兴奋的路线，实现复杂的非互易耦合，特别是难以捉摸的轴子响应。我们发展了一个解析形式主义，均匀化各向异性时空晶体在长波长限制。研究发现，具有合适的滑移-旋转对称性的时空晶体可以具有巨大的轴子型响应，比天然材料大几个数量级。非互易轴子响应可能在光学中有有趣的应用，例如在电磁隔离中，此外还可能激发新形式的光波相互作用。
英文摘要：
Here, we show that spacetime modulations provide an exciting route to realize complex nonreciprocal couplings, and in particular the elusive axion response. We develop an analytical formalism to homogenize anisotropic spacetime crystals in the long wavelength limit. It is found that spacetime crystals with suitable glide-rotation symmetry can have a giant axion-type response, several orders of magnitude larger than in natural materials. The nonreciprocal axion response may have interesting applications in optics, for example in electromagnetic isolation, and in addition may enable exciting new forms of light-wave interactions.
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