Room-Temperature Strong Coupling of Few-Exciton in a Monolayer WS2 with Plasmon and Dispersion Deviation,Nano Letters

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Room-Temperature Strong Coupling of Few-Exciton in a Monolayer WS2 with Plasmon and Dispersion Deviation
Nano Letters ( IF 9.6 ) Pub Date : 2024-01-29 , DOI: 10.1021/acs.nanolett.3c04158
Jie Zhong ₁ , Jun-Yu Li ₁ , Jin Liu ₁ , Yifan Xiang ₁ , He Feng ₁ , Renming Liu ₂ , Wei Li _{1,

3} , Xue-Hua Wang ₁

Affiliation

Engineering room-temperature strong coupling of few-exciton in transition-metal dichalcogenides (TMDCs) with plasmons promises to construct compact and high-performance quantum optical devices. But it remains unimplemented due to their in-plane excitons. Here, we demonstrate the strong coupling of few-exciton within 10 in monolayer WS₂ with the plasmonic mode with a large tangential component of the electric field tightly trapped around the sharp corners of an Au@Ag nanocuboid, the fewest number of excitons observed in the TMDC family so far. Furthermore, we for the first time report a significant deviation with a relative difference of up to 100.6% between the spectrum and eigenlevel splitting dispersions, which increases with decreasing coupling strength. It is also shown that the coupling strength obtained by the conventional concept of both being equal to the measured spectrum splitting is markedly overestimated. Our work enriches the understanding of strong light–matter interactions at room temperature.

中文翻译：

具有等离子体激元和色散偏差的单层 WS2 中少激子的室温强耦合

过渡金属二硫化物（TMDC）中的少数激子与等离子体激元的工程室温强耦合有望构建紧凑且高性能的量子光学器件。但由于其面内激子，它仍未实现。在这里，我们证明了单层 WS ₂中 10 以内的少数激子与等离子体模式的强耦合，其中电场的大切向分量紧紧地捕获在 Au@Ag 纳米立方体的尖角周围，这是在TMDC 家族至今。此外，我们首次报告了光谱和本征级分裂色散之间相对差异高达 100.6% 的显着偏差，并且随着耦合强度的降低而增加。还表明，通过两者等于测量的频谱分裂的传统概念获得的耦合强度被明显高估。我们的工作丰富了对室温下强光与物质相互作用的理解。

更新日期：2024-01-29

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