振荡磁场中超冷分子产生的类Shapiro共振
Shapiro-like Resonance in Ultracold Molecule Production via an Oscillating Magnetic Field
摘要：
研究了利用正弦振荡磁场调制从超冷原子产生超冷分子的过程。当磁场与分子结合能大致共振时，观察到Shapiro共振。它们的共振轮廓很好地拟合的洛伦兹函数。谱线宽度依赖于调制的幅度和持续时间，并被发现是显着扩大的热退相效应。由于多体效应和有限温度效应的共同作用，共振中心发生了位移。我们的理论与最近的实验（S. T.汤普森，E。Hodby和C. E. Wieman，Phys. Rev. Lett. 95，190404（2005））。我们的模型预测了一个1/3上限的分子生产产量在未凝聚的超冷原子云的耦合时间长，而凝聚原子的最佳转换产量可能会超过限制。
英文摘要：
We study the process of production of ultracold molecules from ultracold atoms using a sinusoidally oscillating magnetic field modulation. When the magnetic field is resonant roughly with the molecular binding energy, Shapiro-like resonances are observed. Their resonance profiles are well fitted by the Lorentzian functions. The line widths depend on both the amplitude and the duration of the applied modulations, and are found to be dramatically broadened by thermal dephasing effect. The resonance centers shift due to both many-body effect and finite temperature effect. Our theory is consistent with recent experiment (S. T. Thompson, E. Hodby, and C. E. Wieman, Phys. Rev. Lett. 95, 190404 (2005)). Our model predicts a 1/3 ceiling for the molecular production yield in uncondensed ultracold atomic clouds for a long coupling time, while for the condensed atoms the optimal conversion yield could be beyond the limit.
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