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arXiv 2201.10265cond-mat.mes-hallcond-mat.mtrl-sci
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卤化铅钙钛矿中极化子增强的极化激元非线性

Polaron-enhanced polariton nonlinearity in lead halide perovskites

M. A. Masharin, V. A. Shahnazaryan, F. A. Benimetskiy, D. N. Krizhanovskii, I. A. Shelykh, I. V. Iorsh, S. V. Makarov, A. K. Samusev

摘要:

激子-极化激元相互作用产生的强有效光学非线性效应为实现全光集成逻辑门提供了一个通用的平台。在目前大多数激子材料中,激子对热波动的鲁棒性与激子-激子相互作用的强度之间存在直接联系,使得具有最高水平的激子非线性的材料仅适用于低温温度。在这里,我们表明,强极化效应,钙钛矿材料的特点,允许克服这一限制。也就是说,我们证明了纳米结构的有机-无机卤化物钙钛矿MAPbI $_3$的非线性光学响应的创纪录的高值,实验检测为飞秒激光照射下的极化激元分支的19.7 meV蓝移。这显著高于基于传统半导体和过渡金属二硫属化物单层的样品的特征值。所观察到的强极化子增强的非线性存在的四晶和正交相的MAPbI $_3$,并保持稳定,在高温下。

英文摘要:

Exciton-polaritons offer a versatile platform for realization of all-optical integrated logic gates due to the strong effective optical nonlinearity resulting from the exciton-exciton interactions. In most of the current excitonic materials there exists a direct connection between the exciton robustness to thermal fluctuations and the strength of exciton-exciton interaction, making materials with highest levels of exciton nonlinearity applicable at cryogenic temperatures only. Here, we show that strong polaronic effects, characteristic for perovskite materials, allow to overcome this limitation. Namely, we demonstrate the record-high value of the nonlinear optical response in nanostructured organic-inorganic halide perovskite MAPbI$_3$, experimentally detected as 19.7 meV blueshift of the polariton branch under femtosecond laser irradiation. This is substantially higher than characteristic values for the samples based on conventional semiconductors and monolayers of transition metal dichalcogenides. The observed strong polaron-enhanced nonlinearity exists for both tetragonal and orthorombic phases of MAPbI$_3$, and remains stable at elevated temperatures.

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