晶体对称性能否重塑ENZ光子学？：观点
Can crystal symmetry reshape ENZ photonics?: Opinion
AI总结：
本文围绕ENZ光子学，提出可利用低对称性导体的晶体对称性调控其响应，这类材料或能实现偏振相关增益等效应，可应用于有源与时变纳米光子学。
AI中文摘要：
在过去十年中，近零介电常数（epsilon-near-zero, ENZ）光子学的发展一直围绕着寻找更低损耗和更强非线性响应展开。本文提出了一个不同的问题：晶体对称性是否也可用于调控ENZ响应？本文聚焦于低对称性导体，这类材料的电子态几何结构可产生普通德鲁德（Drude）材料中不存在的电流，这些电流或能实现偏振相关增益、非互易效应以及由对称性和外部偏置调控的超快非线性效应，本文提出这类材料可应用于有源与时变纳米光子学领域。
英文摘要：
Over the last decade, epsilon-near-zero (ENZ) photonics has been driven by the search for lower losses and stronger nonlinear responses. Here, I ask a different question: can crystal symmetry also be used to shape the ENZ response? I focus on low-symmetry conductors, where the geometry of the electronic states can produce electric currents that are not present in ordinary Drude materials. These currents may enable polarization-dependent gain, nonreciprocal effects, and ultrafast nonlinearities controlled by symmetry and an external bias. I suggest that such materials may be useful for active and time-varying nanophotonics.
