Strong Coupling between Moiré-Type Plasmons and Phonons in Suspended Monolayer Metallic Twisted Superlattices,Nano Letters

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Strong Coupling between Moiré-Type Plasmons and Phonons in Suspended Monolayer Metallic Twisted Superlattices
Nano Letters ( IF 9.1 ) Pub Date : 2024-11-20 , DOI: 10.1021/acs.nanolett.4c04841
Bin You ₁ , Yuhan Du ₁ , Shuangxiu Yuan ₁ , Yuan Tian ₁ , Xianghao Meng ₁ , Wenbin Wu ₁ , Zeping Shi ₁ , Guangyi Wang ₁ , Xin Chen ₁ , Xiang Yuan ₁ , Xiaolong Zhu ₁

Affiliation

We demonstrate both experimentally and analytically a strong coupling phenomenon between moiré-type plasmons and phonons within moiré superlattices. We study the dependence of moiré wave vector and the twist angle and numerically simulate and experimentally fabricate metallic moiré superlattices on a suspended thin film SiO₂ substrate at different twist angles. The results suggest that the coupling strength initially increases and then decreases with increasing twist angles. When the twist angle is at 16.26°, we achieve a moiré-type plasmon-phonon strong coupling with a Rabi splitting strength approaching 45 meV. We further analyze the coupling system by utilizing the coupled-harmonic-oscillators theory and quantum mechanical theory. The calculations and numerical simulations further agree with the experimental results. The proposed strong coupling system has the potential to contribute substantially to electromagnetic field controlling and coupling.

中文翻译：

悬浮单层金属扭曲超晶格中莫尔型等离激元和声子之间的强耦合

我们从实验和分析上证明了莫尔型等离激元和莫尔超晶格内的声子之间的强耦合现象。我们研究了莫尔波矢量和扭曲角的依赖性，并在悬浮的薄膜 SiO ₂ 衬底上进行了数值模拟和实验制造了不同扭曲角的金属莫尔超晶格。结果表明，耦合强度最初随着扭曲角的增加而增加，然后减小。当扭转角为 16.26° 时，我们实现了莫尔型等离激元-声子强耦合，拉比劈裂强度接近 45 meV。我们利用耦合谐振子理论和量子力学理论进一步分析了耦合系统。计算和数值模拟结果与实验结果进一步吻合。所提出的强耦合系统有可能为电磁场控制和耦合做出重大贡献。

更新日期：2024-11-20

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