Chiral perovskites have attracted considerable attention as excellent spin-emitting materials for applications in spintronics, quantum optics, and biological. Especially in drug development of biological, weak chirality molecules are frequently selected to reduce the side effects of toxics, and there is a common defect for accurately detecting the weak chirality with common methods at room temperature. In this study, formamidine lead bromide perovskite nanocrystals (FAPbBr3 NCs) were coated with chiral ligands, whose chirality was too weak to be observed in the visible region at room temperature. Thus, by characterizing the transverse shift of photonic spin Hall effect (SHE), the accurate discrimination of weak chirality in the visible region was achieved successfully. By measuring the shift value and light spot splitting of photonic SHE at the same concentration, NEA-coated FAPbBr3 NCs can effectively enhance the chirality of naphthalene ethylamine (NEA) ligands when under the mutually reinforcement of chiral molecular and inorganic parts. In addition, we furtherly clearly distinguished the tiny chiral distinction of NEA-coated FAPbBr3 NCs with different particle sizes, which revealed that the chirality decreases with the increase of particle size. These findings could provide effective solutions for the detection and application of weak chirality in hybrid perovskite nanocrystals in universal environment.

中文翻译：

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使用光子自旋霍尔效应的混合钙钛矿纳米晶体弱手性增强的实验证明

手性钙钛矿作为出色的自旋发射材料在自旋电子学、量子光学和生物领域的应用引起了广泛关注。尤其是在生物药物开发中，经常选择弱手性分子来减少毒物的副作用，而在室温下用常规方法准确检测弱手性分子存在一个共同的缺陷。在这项研究中，甲脒溴化铅钙钛矿纳米晶体（FAPbBr3NCs）涂有手性配体，其手性太弱，在室温下的可见光区域无法观察到。因此，通过表征光子自旋霍尔效应（SHE）的横向位移，成功实现了对可见光区弱手性的准确辨别。通过测量相同浓度的光子 SHE 的位移值和光斑分裂，NEA 包覆的 FAPbBr3在手性分子和无机部分的相互增强下，NCs可以有效增强萘乙胺（NEA）配体的手性。此外，我们进一步清楚地区分了 NEA 涂层 FAPbBr 的微小手性差异3具有不同粒径的NCs，这表明手性随着粒径的增加而降低。这些发现可为在通用环境中检测和应用杂化钙钛矿纳米晶体中的弱手性提供有效的解决方案。