论文标题
铅卤化物钙钛矿中的二极化偏极非线性
Polaron-enhanced polariton nonlinearity in lead halide perovskites
论文作者
论文摘要
激子 - 波利顿（Exciton-Polaritons）为实现全光积分逻辑门提供了一种多功能平台，这是由于激烈的效率非线性是由激子 - exciton相互作用引起的。在当前的大多数激子材料中，激烈的鲁棒性与热波动与激子 - 外激体相互作用的强度之间存在直接连接，从而使具有适用于低温温度下的激子非线性的材料具有最高水平的激子非线性。在这里，我们表明强大的极性效应是钙钛矿材料的特征，可以克服这种限制。也就是说，我们证明了纳米结构的有机卤化物卤化物钙钛矿mapbi $ _3 $的非线性光学响应的创纪录最高值，在Femtososecond Laser Iradadiation下，实验检测到Polartiton分支的19.7 MeV Blueshift。基于过渡金属二核苷的常规半导体和单层的样品的特征值大大高于特征值。对于Mapbi $ _3 $的四方和正晶阶段而言，观察到的强偏增强的非线性都存在，并且在升高温度下保持稳定。
Exciton-polaritons offer a versatile platform for realization of all-optical integrated logic gates due to the strong effective optical nonlinearity resulting from the exciton-exciton interactions. In most of the current excitonic materials there exists a direct connection between the exciton robustness to thermal fluctuations and the strength of exciton-exciton interaction, making materials with highest levels of exciton nonlinearity applicable at cryogenic temperatures only. Here, we show that strong polaronic effects, characteristic for perovskite materials, allow to overcome this limitation. Namely, we demonstrate the record-high value of the nonlinear optical response in nanostructured organic-inorganic halide perovskite MAPbI$_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.
