Plasmon-Mediated Coherent Superposition of Discrete Excitons under Strong Exciton–Plasmon Coupling in Few-Layer MoS2 at Room Temperature,ACS Photonics

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Plasmon-Mediated Coherent Superposition of Discrete Excitons under Strong Exciton–Plasmon Coupling in Few-Layer MoS2 at Room Temperature
ACS Photonics ( IF 6.5 ) Pub Date : 2020-04-07 , DOI: 10.1021/acsphotonics.0c00233
Aaron H. Rose _{1,

2} , Jeremy R. Dunklin ₁ , Hanyu Zhang ₁ , Juan M. Merlo _{2,

3} , Jao van de Lagemaat _{1,

4}

Affiliation

We demonstrate room temperature coherent hybridization of the A- and B-excitons in few-layer MoS₂, mediated by simultaneous strong coupling to surface plasmon polaritons. Few-layer MoS₂ was placed on a tunable plasmonic structure and the system’s dispersion was measured by tuning the plasmon energy across the exciton energies. Strong coupling was observed as double Rabi splitting at the A- and B-excitons of 81 and 93 meV, respectively. A coupled harmonic oscillator model sheds light on the nature of the interaction, revealing a quantum superposition of the A- and B-excitons, mediated by the plasmon interaction. This observation suggests the possibility of room temperature intra- or intervalley quantum information transport and/or spin entanglement. The experiment confirms a previous theoretical prediction of room temperature exciton–exciton hybridization in two-dimensional MoS₂. Further, through modeling we find that room temperature strong coupling is a general phenomenon among two-dimensional transition metal dichalcogenide exciton–plasmon systems.

中文翻译：

室温少层MoS ₂中强激子-等离子耦合下离散激子的等离子介导相干叠加

我们展示了在几层MoS ₂中的A和B激子的室温相干杂交，通过同时强烈耦合到表面等离激元极化子介导。少量的MoS ₂将其放置在可调等离子体激元结构上，并通过调整激子能量上的等离子体激元能量来测量系统的色散。分别在81和93 meV的A和B激子处出现了双Rabi分裂，观察到了强耦合。耦合谐振子模型揭示了相互作用的性质，揭示了由等离激元相互作用介导的A和B激子的量子叠加。该观察结果表明室温下内部或区间量子信息传输和/或自旋纠缠的可能性。实验证实了二维MoS ₂中室温激子-激子杂交的先前理论预测。。此外，通过建模，我们发现，室温强耦合是二维过渡金属二硫化氢激子-等离子体激元系统中的普遍现象。

更新日期：2020-04-07

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