Coherent manipulation of photochemical spin-triplet formation in quantum dot–molecule hybrids

IF 37.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Meng Liu, Jingyi Zhu, Guohui Zhao, Yuxuan Li, Yupeng Yang, Kaimin Gao, Kaifeng Wu
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引用次数: 0

Abstract

The interconversion between singlet and triplet spin states of photogenerated radical pairs is a genuine quantum process, which can be harnessed to coherently manipulate the recombination products through a magnetic field. This control is central to such diverse fields as molecular optoelectronics, quantum sensing, quantum biology and spin chemistry, but its effect is typically fairly weak in pure molecular systems. Here we introduce hybrid radical pairs constructed from semiconductor quantum dots and organic molecules. The large g-factor difference enables us to directly observe the radical-pair spin quantum beats usually hidden in previous studies, which are further accelerated by the strong exchange coupling of radical pairs enabled by the quantum confinement of quantum dots. The rapid quantum beats enable the efficient and coherent control of charge recombination dynamics at room temperature, with the modulation level of the yield of spin-triplet products reaching 400%. Photochemical quantum process in quantum dot–molecule hybrids is normally weak and difficult to be coherently controlled. Radical-pair spin quantum beats can enable the efficient and coherent control of charge recombination at room temperature.

Abstract Image

Abstract Image

量子点-分子杂化中光化学自旋三重态形成的相干操纵
光生自由基对的单重态和三重态自旋态之间的相互转换是一个真正的量子过程,可以利用磁场相干地操纵重组产物。这种控制对于分子光电子学、量子传感、量子生物学和自旋化学等不同领域至关重要,但在纯分子系统中,其效果通常相当弱。本文介绍了由半导体量子点和有机分子构成的杂化自由基对。较大的g因子差异使我们能够直接观察到以往研究中通常隐藏的基对自旋量子拍,而量子点的量子约束使基对的强交换耦合进一步加速了自旋量子拍。快速量子拍使得室温下电荷复合动力学的有效和相干控制成为可能,自旋三重态产物产率的调制水平达到400%。
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来源期刊
Nature Materials
Nature Materials 工程技术-材料科学:综合
CiteScore
62.20
自引率
0.70%
发文量
221
审稿时长
3.2 months
期刊介绍: Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
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