Interlayer excitons in van der Waals heterostructures of two-dimensional transition-metal dichalcogenides have recently emerged as a fascinating platform for quantum many-body effects, long-range interactions, and optovalleytronic applications. The practical implementation of such phenomena and applications requires further development of the long-lived character of interlayer excitons. Whereas material developments have successfully enhanced the nonradiative lifetime, the out-of-plane polarization nature of the interlayer excitons has made it challenging to improve the radiative lifetime with conventional photonic mirrors. Here, we propose and systematically analyze a plasmonic photonic crystal (PPhC) mirror that can increase the radiative lifetime of interlayer excitons by 2 orders of magnitude. Based on the vacuum field transition, the PPhC mirror supports spatially uniform radiative decay suppression over its territory, which is crucial for engineering the interlayer excitons not localized at a specific position. The PPhC mirror platform offers new possibilities for realizing long-lived interlayer exciton-based nanodevices.

中文翻译：

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用于长寿命层间激子生成的等离子体光子晶体镜

二维过渡金属二硫属化物的范德华异质结构中的层间激子最近成为量子多体效应、长程相互作用和光电子应用的迷人平台。这种现象和应用的实际实施需要进一步发展层间激子的长寿命特性。尽管材料的发展已经成功地提高了非辐射寿命，但层间激子的面外偏振特性使得使用传统光子镜提高辐射寿命具有挑战性。在这里，我们提出并系统地分析了等离子体光子晶体 (PPhC) 反射镜，该反射镜可以将层间激子的辐射寿命增加 2 个数量级。基于真空场跃迁，PPhC 反射镜支持在其领土上空间均匀的辐射衰减抑制，这对于设计未定位在特定位置的层间激子至关重要。PPhC 镜面平台为实现长寿命的层间激子纳米器件提供了新的可能性。