Chiral interfaces provide a new platform to execute quantum control of light-matter interactions. One phenomenon which has emerged from engineering such nanophotonic interfaces is spin-momentum locking akin to similar reports in electronic topological materials and phases. While there are reports of spin-momentum locking with combination of chiral emitters and/or chiral metamaterials with directional far field excitation it is not readily observable with both achiral emitters and metamaterials. Here, we report the observation of photonic spin-momentum locking in the form of directional and chiral emission from achiral quantum dots (QDs) evanescently coupled to achiral hyperbolic metamaterials (HMM). Efficient coupling between QDs and the metamaterial leads to emergence of these photonic topological modes which can be detected in the far field. We provide theoretical explanation for the emergence of spin-momentum locking through rigorous modeling based on photon Green's function where pseudo spin of light arises from coupling of QDs to evanescent modes of HMM.

中文翻译：

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非手性超材料与量子点耦合引起的光子自旋动量锁定观察

手性界面提供了一个新的平台来执行光物质相互作用的量子控制。从工程这种纳米光子界面中出现的一种现象是自旋动量锁定，类似于电子拓扑材料和相中的类似报道。虽然有报道称自旋动量锁定与手性发射器和/或手性超材料与定向远场激发相结合，但用非手性发射器和超材料都不容易观察到。在这里，我们报告了从非手性量子点 (QD) 倏逝耦合到非手性双曲超材料 (HMM) 的定向和手性发射形式的光子自旋动量锁定的观察结果。量子点和超材料之间的有效耦合导致这些光子拓扑模式的出现，这些模式可以在远场中检测到。