AI 中文总结
该研究在非拓扑弗洛凯光子晶体中，通过z周期人工规范场实现了鲁棒单向连续谱边缘态，其可承受多种噪声与缺陷，为非拓扑系统的鲁棒光传播提供了新范式。
AI 中文摘要
鲁棒的单向边缘传播通常被归因于拓扑保护。连续谱中的边缘态（EICs）能否在非拓扑系统中表现出这种鲁棒性仍是一个开放性问题。本文在由螺旋波导蜂窝晶格构成的弗洛凯光子晶体（PhCs）中实现了鲁棒的单向EICs，该系统同时破坏了时间反演对称性和空间反演对称性。在该系统的拓扑平凡参数区间内，陈数、谷陈数和绕数均为零，此时EIC的鲁棒性与拓扑解耦，其鲁棒性源于与螺旋晶格几何锁定的z周期弗洛凯人工规范场。数值模拟表明，该EIC可承受120个弯曲边缘、6%的 onsite 势噪声以及27%的跃迁相位噪声。本研究为非拓扑系统中的鲁棒光传播建立了范式，并拓宽了单向EICs的物理基础。
英文摘要
Robust unidirectional edge propagation is conventionally attributed to topological protection. Whether edge states in the continuum (EICs) can exhibit such robustness in non-topological systems remains an open question. Here we demonstrate robust unidirectional EICs in Floquet photonic crystals (PhCs) composed of a honeycomb lattice of helical waveguides, where both time-reversal and spatial inversion symmetries are broken. Within a topologically trivial parameter regime of this system, where the Chern, valley Chern, and winding numbers all vanish, the EIC robustness is decoupled from topology. Instead, the robustness originates from a z-periodic Floquet artificial gauge field geometrically locked to the helical lattice. Numerical simulations show that the EIC survives 120 bent edges, 6% on-site potential noise, and 27% hopping phase noise. This work establishes a paradigm for robust light propagation in non topological systems and broadens the physical basis for unidirectional EICs.
