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arXiv 2401.03026cond-mat.quant-gas
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玻色增强的驱动原子-分子凝聚体弛豫

Bose-enhanced relaxation of driven atom-molecule condensates

Dimitri Pimenov, Erich J. Mueller

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journal version
发表信息：
Phys. Rev. A 109, 043311 (2024)
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AI总结：

研究受实验启发的原子-分子凝聚体相互转化振荡的慢衰减，发现主要阻尼来自共振原子对衰变且呈玻色增强的非指数形式，振荡磁场虽短期增强振荡但加速衰减。

摘要：

受近期实验启发，我们研究了超冷原子凝聚体与分子凝聚体之间的相互转化，量化了由此产生的振荡及其缓慢衰减。我们发现，在接近平衡时，主要的阻尼来源是凝聚分子衰变为非凝聚的原子对，这些原子对的动能与振荡的原子-分子相互转化频率共振。然而，这种衰变是非指数式的，因为共振原子对的强布居导致了玻色增强。引入一个振荡磁场，周期性地调制分子结合能，在短时间内增强了振荡。然而，由此产生的原子对产生过程的增强导致了加速衰减，迅速切断了初始的振荡增长。

英文摘要：

Motivated by recent experiments we study the interconversion between ultracold atomic and molecular condensates, quantifying the resulting oscillations and their slow decay. We find that near equilibrium the dominant damping source is the decay of condensed molecules into non-condensed pairs, with a pair kinetic energy that is resonant with the frequency of the oscillating atom-molecule interconversions. The decay, however, is non-exponential, as strong population of the resonant pairs leads to Bose enhancement. Introducing an oscillating magnetic field, which periodically modulates the molecular binding energy, enhances the oscillations at short times. However, the resulting enhancement of the pair-production process results in an accelerated decay which rapidly cuts off the initial oscillation growth.

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