揭示和操纵 CsPbI3 包晶量子点中明亮激子的隐藏细微结构相干。

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-11-13 Epub Date: 2024-10-31 DOI:10.1021/acs.nanolett.4c04772

Kaimin Gao, Yuxuan Li, Yupeng Yang, Boyu Zhang, Meng Liu, Jingyi Zhu, Kaifeng Wu

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引用次数: 0

摘要

观察和了解卤化铅过氧化物量子点（QDs）中明亮激子的精细结构分裂，对于它们在量子光源和激子相干操纵方面的新兴应用至关重要。最近的研究表明，集合级偏振分辨瞬态吸收光谱可以揭示两个精细结构级之间的相干所产生的量子节拍。在此，我们报告了利用低温磁量子节拍光谱观测到的隐藏在以往研究中的额外精细结构量子相干性。在 ∼6 nm CsPbI3 QDs 中，我们观察到 1.7 K 时的两个分裂能量分别为 0.25 和 1.20 meV，当施加高达 7 T 的纵向磁场时，这两个分裂能量分别逐渐增加到 0.74 和 1.55 meV。根据磁场依赖性，我们可以提取出两个不同的标称朗德 g 因子，它们对应于相对于外部磁场具有不同取向的 QD。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Revealing and Manipulating Hidden Fine-Structure Coherence of Bright Excitons in CsPbI3 Perovskite Quantum Dots.

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Revealing and Manipulating Hidden Fine-Structure Coherence of Bright Excitons in CsPbI₃ Perovskite Quantum Dots.

Observation and understanding of fine-structure splitting of bright excitons in lead halide perovskite quantum dots (QDs) are crucial to their emerging applications in quantum light sources and exciton coherence manipulation. Recent studies demonstrate that ensemble-level polarization-resolved transient absorption spectroscopy can reveal the quantum beats arising from the coherence between two fine-structure levels. Here we report the observation of an extra fine-structure quantum coherence hidden in previous studies by using cryo-magnetic quantum beat spectroscopy. In ∼6 nm CsPbI₃ QDs, two splitting energies of 0.25 and 1.20 meV were observed at 1.7 K, which gradually increased to 0.74 and 1.55 meV, respectively, when a longitudinal magnetic field up to 7 T was applied. The field dependence allowed us to extract two distinct nominal Landé g-factors corresponding to QDs with different orientations with respect to the external field.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.