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arXiv 2408.08415cond-mat.quant-gasquant-ph
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窄 Feshbach 共振附近幺正玻色气体动力学中的普适原子-分子相干振荡

Universal coherent atom-molecule oscillations in the dynamics of the unitary Bose gas near a narrow Feshbach resonance

Ke Wang, Zhendong Zhang, Shu Nagata, Zhiqiang Wang, K. Levin

AI总结:

本文研究了窄 Feshbach 共振下幺正玻色气体的淬火动力学,发现原子凝聚体快速淬火后产生原子与分子的相干振荡,并提出超越 Hartree-Fock-Bogoliubov 的动力学框架以解释该普适多体相互作用现象。

摘要:

围绕宽 Feshbach 共振的幺正玻色气体淬火实验导致了普适动力学的发现。这种普适性体现在测量的原子动量分布中,其中渐近地发现了一种准平衡的亚稳态,其动量分布和时间尺度均由粒子密度决定。在本文中,我们展示了针对宽度为 8.3 mG 的 $^{133}$Cs 原子极窄 Feshbach 共振情况的对应研究。与早先报道的行为形成鲜明对比的是,观察到原子凝聚体到幺正性的快速淬火最终导致了涉及动态产生的凝聚分子、非凝聚分子和原子的相干振荡。在所有类型的粒子中均观察到了由 Feshbach 耦合决定的相同特征频率。为了理解这些淬火动力学以及这些不同粒子种类是如何产生的,我们开发了一个超越 Hartree-Fock-Bogoliubov 的动力学框架,包含了一种新型的原子与分子之间的交叉关联。这导致了与测量频率的定量一致性。我们的结果可应用于与窄 Feshbach 共振相关的一般玻色超流体类别,为由量子多体相互作用主导的普适动力学确立了新范式。

英文摘要:

Quench experiments on a unitary Bose gas around a broad Feshbach resonance have led to the discovery of universal dynamics. This universality is manifested in the measured atomic momentum distributions where, asymptotically, a quasi-equilibrated metastable state is found in which both the momentum distribution and the time scales are determined by the particle density. In this paper we present counterpart studies but for the case of a very narrow Feshbach resonance of $^{133}$Cs atoms having a width of 8.3 mG. In dramatic contrast to the behavior reported earlier, a rapid quench of an atomic condensate to unitarity is observed to ultimately lead to coherent oscillations involving dynamically produced condensed and non-condensed molecules and atoms. The same characteristic frequency, determined by the Feshbach coupling, is observed in all types of particles. To understand these quench dynamics and how these different particle species are created, we develop a beyond Hartree-Fock-Bogoliubov dynamical framework including a new type of cross correlation between atoms and molecules. This leads to a quantitative consistency with the measured frequency. Our results, which can be applied to the general class of bosonic superfluids associated with narrow Feshbach resonances, establish a new paradigm for universal dynamics dominated by quantum many-body interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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