Bucher Tobias, Fedorova Zlata, Abasifard Mostafa, Mupparapu Rajeshkumar, Wurdack Matthias J, Najafidehaghani Emad, Gan Ziyang, Knopf Heiko, George Antony, Eilenberger Falk, Pertsch Thomas, Turchanin Andrey, Staude Isabelle
Institute of Solid State Physics, Friedrich Schiller University Jena, 07743, Jena, Germany.
Institute of Applied Physics, Friedrich Schiller University Jena, 07745, Jena, Germany.
Nat Commun. 2024 Nov 21;15(1):10098. doi: 10.1038/s41467-024-54359-y.
The valley degree of freedom in atomically thin transition metal dichalcogenides, coupled with valley-contrasting optical selection rules, holds great potential for future electronic and optoelectronic devices. Resonant optical nanostructures emerge as promising tools for controlling this degree of freedom at the nanoscale. However, their impact on the circular polarization of valley-selective emission remains poorly understood. In our study, we explore a hybrid system where valley-specific emission from a molybdenum disulfide monolayer interacts with a resonant plasmonic nanosphere. Contrary to the simple intuition that a centrosymmetric nanoresonator mostly preserves the degree of circular polarization, our cryogenic experiments reveal significant depolarization of the photoluminescence scattered by the nanoparticle. This striking effect presents an ideal platform for studying the mechanisms governing light-matter interactions in such hybrid systems. Our full-wave numerical analysis provides insights into the key physical mechanisms affecting the polarization response, offering a pathway toward designing novel valleytronic devices.
原子级薄的过渡金属二硫属化物中的谷自由度，与谷对比度光学选择规则相结合，为未来的电子和光电器件带来了巨大潜力。共振光学纳米结构成为在纳米尺度上控制这种自由度的有前途的工具。然而，它们对谷选择性发射的圆极化的影响仍知之甚少。在我们的研究中，我们探索了一种混合系统，其中二硫化钼单层的谷特异性发射与共振等离子体纳米球相互作用。与中心对称纳米谐振器大多保留圆极化程度的简单直觉相反，我们的低温实验揭示了纳米颗粒散射的光致发光的显著去极化。这种显著效应为研究此类混合系统中光与物质相互作用的机制提供了理想平台。我们的全波数值分析深入了解了影响极化响应的关键物理机制，为设计新型谷电子器件提供了一条途径。
