标题： 通过振荡磁场形成费什巴赫分子：次谐共振 显示英文标题

标题： Feshbach molecule formation through an oscillating magnetic field: subharmonic resonances

摘要： 研究了通过磁场Feshbach共振且磁场带有正弦调制将超冷原子转化为分子的过程。 分析了该方法在玻色原子气体中的不同实际实现方式。 我们的模型通过有效简化完整的微观动力学来纳入多体效应。 此外，我们模拟了实验条件下系统作为热气体和凝聚体的制备过程。 部分实验结果得到了澄清。 阐明了观测到的生产效率对磁场调制频率、振幅和应用时间依赖性的起源。 我们的结果还揭示了原子密度在动力学中的作用，特别是其在原子-分子转换过程饱和现象中的作用。 显示英文摘要

摘要： The conversion of ultracold atoms to molecules via a magnetic Feshbach resonance with a sinusoidal modulation of the field is studied. Different practical realizations of this method in Bose atomic gases are analyzed. Our model incorporates many-body effects through an effective reduction of the complete microscopic dynamics. Moreover, we simulate the experimental conditions corresponding to the preparation of the system as a thermal gas and as a condensate. Some of the experimental findings are clarified. The origin of the observed dependence of the production efficiency on the frequency, amplitude, and application time of the magnetic modulation is elucidated. Our results uncover also the role of the atomic density in the dynamics, specifically, in the observed saturation of the atom-molecule conversion process.