CsPbBr3纳米晶体中激子自旋动力学与量子约束维数的关系

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-04-28 DOI:10.1021/acs.nanolett.5c00828

Evan H. Oriel, Kseniia Shcherbak, Ihor Cherniukh, Dmitry N. Dirin, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Lin X. Chen, Richard D. Schaller

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引用次数: 0

摘要

半导体纳米材料为产生用于量子技术的光学可寻址自旋提供了一个有前途的平台。在这里，我们研究了CsPbBr3纳米球、立方体和棒跨越零维（0D）到三维（3D）的转变，以研究维度和形状对激子自旋退相干的影响。利用圆偏振瞬态吸收光谱，我们发现自旋弛豫速率与表面体积比无关，而是与最短维度的长度有关。此外，表面质量和终止的差异似乎对被测材料的自旋弛豫率没有影响，相反，自旋弛豫率与激子结合能的关系最为明显。最后，减小纳米材料的维数可以减小多激子相互作用对自旋弛豫速率的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Dependence of Exciton Spin Dynamics on Quantum Confinement Dimensionality in CsPbBr3 Nanocrystals

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Dependence of Exciton Spin Dynamics on Quantum Confinement Dimensionality in CsPbBr3 Nanocrystals

Semiconductor nanomaterials offer a promising platform to produce optically addressable spins for use in quantum technologies. Here, we examine CsPbBr₃ nanospheres, cubes, and rods spanning the zero-dimensional (0D) to three-dimensional (3D) transition to investigate the influence of dimensionality and shape on exciton spin decoherence. Using circularly polarized transient absorption spectroscopy, we find that the spin relaxation rate is independent of the surface to volume ratio and instead follows a dependence on the length of the shortest dimension. Additionally, differences in surface quality and termination appear to have no effect on the spin relaxation rate for measured materials, and instead the spin relaxation rate is most clearly correlated with the exciton binding energy. Finally, decreasing the dimensionality of the nanomaterials decreases the influence of multiexciton interactions on the spin relaxation rate.

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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.