标题： 通过涌现局域对称性实现的无反射模式例外简并 显示英文标题

标题： Synthetic Reflectionless Mode Exceptional Degeneracies via Emergent Local Symmetries

摘要： 我们提出了一种新型的物理可实现的奇异点简并（EPDs），对应于合成无反射模式（SRM）。这些是定义在合成频率维度上的辅助波算子的解，并描述了入射到Floquet驱动腔中的无反射波。SRM-EPD是通过适当的Floquet驱动在辅助算子上施加自发局部PT对称性而产生的。它的存在表明可以设计具有上下目标频率转换和平坦传输光谱的波前和时间调制方案。该理论通过驱动射频谐振器的仿真得到验证。 显示英文摘要

摘要： We propose a new kind of physically realizable exceptional point degeneracies (EPDs) corresponding to synthetic reflectionless modes (SRM). These are solutions of an auxiliary wave operator that is defined in synthetic frequency dimensions and describe incoming reflectionless waves onto a Floquet-driven cavity. The SRM-EPD emerges as a consequence of a spontaneous local PT-symmetry imposed on the auxiliary operator via appropriate Floquet driving. Its presence signifies the possibility to design wavefronts and time-modulated schemes with up/down targeted frequency conversion and flat transmission spectra. The theory is validated via simulations with driven RF resonators.