Many-body chemical reactions in a quantum degenerate gas
Many-body chemical reactions in a quantum degenerate gas
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DOI：
10.1038/s41567-023-02139-8
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发表时间：
2022-07
期刊：
影响因子：
19.6
通讯作者：
Zhendong Zhang;S. Nagata;Kai-Xuan Yao;C. Chin
中科院分区：
文献类型：
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作者：
Zhendong Zhang;S. Nagata;Kai-Xuan Yao;C. Chin
量子简并区的化学反应可用物质波场的混合来描述。在涉及玻色子反应物和产物的多体反应中，如原子和分子玻色-爱因斯坦凝聚体的耦合，量子相干和玻色子增强是反应动力学的主要特征。然而，到目前为止，对这些多体现象的观察，也就是我们所说的“超级化学”，一直难以捉摸。本文报道了在Feshbach共振附近观察到玻色凝聚原子和分子之间的相干和集体反应耦合。从原子凝聚体开始，反应开始于分子的快速形成，随后是分子在平衡过程中的布居振荡。我们在密度较高的样品中观察到较快的振荡，这表明玻色子增强。我们提出了一个量子场模型，该模型很好地捕捉了动力学，并允许我们确定三体复合是主导的反应过程。我们的发现加深了我们对量子多体化学的理解，并为控制量子简并的化学反应提供了见解。
Chemical reactions in the quantum degenerate regime are described by the mixing of matter-wave fields. In many-body reactions involving bosonic reactants and products, such as coupled atomic and molecular Bose–Einstein condensates, quantum coherence and bosonic enhancement are key features of the reaction dynamics. However, the observation of these many-body phenomena, also known as ‘superchemistry’, has been elusive so far. Here we report the observation of coherent and collective reactive coupling between Bose-condensed atoms and molecules near a Feshbach resonance. Starting from an atomic condensate, the reaction begins with the rapid formation of molecules, followed by oscillations of their populations during the equilibration process. We observe faster oscillations in samples with higher densities, indicating bosonic enhancement. We present a quantum field model that captures the dynamics well and allows us to identify three-body recombination as the dominant reaction process. Our findings deepen our understanding of quantum many-body chemistry and offer insights into the control of chemical reactions at quantum degeneracy.