发表机构
Tsinghua University; Beijing National Research Center for Information Science and Technology (BNRist)（清华大学; 北京信息科学与技术国家研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一种基于衍射杂化的无魔角平带机制，在单层莫尔光机械晶体中同时实现光子与声子平带，并实验观测其局域模式与光机械相互作用。
AI 中文摘要
莫尔平带通过抑制群速度增强局域化和相互作用，但现有方法大多针对单一物理场，因为不同的激发通常需要不同且精细调谐的魔角构型。这里我们提出一种基于莫尔折叠带之间强衍射杂化的平带机制。周期失配的调制打开了不同的耦合通道，其杂化重整化能带色散。一个有效哈密顿量表明，增加衍射耦合会逐步抑制群速度，驱动系统进入无需特定场魔角构型的平带区域。这种耦合诱导机制使得不同物理激发能够实现带平坦化。我们在单层莫尔光机械晶体中演示了该机制，其中光子与声子平带同时实现，并实验观测到它们的局域模式和光机械相互作用。除光子和声子系统外，该机制可能扩展到其他波和准粒子平台，为在莫尔系统中共同局域化和耦合不同物理场提供了一条通用途径。
英文摘要
Moiré flat bands enhance localization and interactions through suppressed group velocity, but existing approaches largely target a single physical field because distinct excitations generally require different, finely tuned magic configurations. Here we introduce a flat-band mechanism based on strong diffractive hybridization among moiré-folded bands. Period-mismatched modulations open distinct coupling channels whose hybridization renormalizes the band dispersion. An effective Hamiltonian shows that increasing the diffractive coupling progressively suppresses the group velocity, driving the system toward a flat-band regime without field-specific magic configurations. This coupling-induced mechanism enables band flattening across distinct physical excitations. We demonstrate this mechanism in a single-layer moiré optomechanical crystal, where photonic and phononic flat bands are simultaneously realized, and their localized modes and optomechanical interaction are experimentally observed. Beyond photonic and phononic systems, this mechanism may extend to other wave and quasiparticle platforms, providing a general route to co-localizing and coupling distinct physical fields in moiré systems.
