Many-body effects on nonadiabatic Feshbach conversion in bosonic systems
Many-body effects on nonadiabatic Feshbach conversion in bosonic systems
复制标题
玻色子系统中非绝热 Feshbach 转换的多体效应
DOI：
10.1103/physreva.78.013618
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发表时间：
2007-12
影响因子：
2.9
通讯作者：
Liu, Jie
中科院分区：
文献类型：
--
作者：
Liu, Bin;Fu, Li-Bin;Liu, Jie
我们研究了当外加磁场扫过Feshbach共振时，冷玻色原子转化为分子的动力学。我们的分析依赖于一个量子微观模型，该模型解释了缔合过程中的多体效应。结果表明，由于多体效应的影响，Landau-Zener模型所描述的二体分子产生的图像发生了显著的变化。在非绝热区域，我们导出了分子转换效率的解析表达式，解释了Landau-Zener公式的预测与实验数据之间的差异[E.Hodby等人，Phys.莱特牧师。94、120402(2005年)]。我们的理论进一步扩展到异核双原子分子的形成，并给出了一些有趣的预测。
We investigate the dynamics of converting cold bosonic atoms to molecules when an external magnetic field is swept across a Feshbach resonance. Our analysis relies on a quantum microscopic model that accounts for many-body effects in the association process. We show that the picture of two-body molecular production depicted by the Landau-Zener model is significantly altered due to many-body effects. In the nonadiabatic regime, we derive an analytic expression for molecular conversion efficiency that explains the discrepancy between the prediction of the Landau-Zener formula and the experimental data [E. Hodby et al., Phys. Rev. Lett. 94, 120402 (2005)]. Our theory is further extended to the formation of heteronuclear diatomic molecules and gives some interesting predictions.