In photonics and condensed‐matter physics, optical control of many‐body phenomena is significant for fundamental studies and optoelectronic applications. Herein, pronounced saturable excitonic behaviors in the nontransient optical response of monolayer MoS₂ pumped by continuous‐wave laser are observed. These behaviors include bleaching of the excitonic absorption and a blueshift of the exciton resonance at increasing power of pump light, which are attributed to the band‐filling nonlinearity of excitons and repulsion‐dominated interaction between them, respectively. Moreover, it is also shown that the substrate has a strong impact on these phenomena, which can be ascribed to the changes in the dielectric screening effect and the trion spectral weight. In nontransient regime, the results not only demonstrate the analogy between excitons and atoms with respect to photon–particle and interparticle interactions, but also show the optical control of this many‐body effect. These findings can also push forward the research of photonic devices based on 2D materials.

中文翻译：

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单层MoS2中饱和激子行为的观察和光学控制

在光子学和凝聚态物理中，多体现象的光学控制对于基础研究和光电应用具有重要意义。在此，单层MoS ₂的非瞬态光学响应中具有明显的饱和激子行为观察到由连续波激光泵浦。这些行为包括在泵浦光功率增加时激子吸收的漂白和激子共振的蓝移，这分别归因于激子的能带填充非线性和它们之间斥力主导的相互作用。此外，还显示出基板对这些现象具有强烈的影响，这可归因于介电屏蔽效应和三重子光谱权重的变化。在非瞬态状态下，结果不仅证明了激子与原子之间关于光子-粒子和粒子间相互作用的类比，而且还表明了这种多体效应的光学控制。这些发现也可以推动基于2D材料的光子器件的研究。