用闵可夫斯基等折射时空晶体复制物理运动
Replicating Physical Motion with Minkowskian Isorefractive Spacetime Crystals
摘要：
在这里，我们表明，具有行波调制的等折射时空晶体可以严格地模仿运动物质系统的响应。虽然一般的时空晶体的特征在于在同向移动框架中的双各向异性耦合，等折射晶体具有与观察者无关的响应，这导致无双各向异性的各向同性本构关系。我们展示了如何利用这一属性的计算中的能带图的等折射时空晶体在实验室框架和在研究中的合成菲涅耳阻力。此外，我们讨论的影响，考虑无论是伽利略或洛伦兹变换在时空晶体的均匀化，显示出有效的响应是独立的所考虑的变换。
英文摘要：
Here, we show that isorefractive spacetime crystals with a travelling-wave modulation may mimic rigorously the response of moving material systems. While generic spacetime crystals are characterized by a bi-anisotropic coupling in the co-moving frame, isorefractive crystals have a response that is observer independent, which leads to isotropic constitutive relations free of bianisotropy. We show how to take advantage of this property in the calculation of the band diagrams of isorefractive spacetime crystals in the laboratory frame and in the study of the synthetic Fresnel drag. Furthermore, we discuss the impact of considering either a Galilean or a Lorentz transformation in the homogenization of spacetime crystals, showing that the effective response is independent of the considered transformation.
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