量子遂穿在双阱异核分子形成过程中的作用

摘要

对于束缚在双阱中的两组分玻色-爱因斯坦凝聚体,本文研究了基于光缔合机制形成分子的过程中,量子隧穿所起的作用.该双阱外势可以在实验上利用磁场生成的谐振子势和由蓝失谐光或射频源生成的中心势垒来实现.在合适的光场中,我们分析了系统在不同初始状态下的短时极限量子动力学,同时对系统做了在平均场近似下的数值计算分析.我们发现无论是隧穿强度还是初始状态的制备都对系统的动力学有很大的影响.我们还计算了同核分子在这些情况下的结果,并和异核分子计算的结果作了比较.量子化的光缔合光场在分子形成过程的影响也在文章中给予了讨论.%In this paper,we studied the role of quantum tunneling in molecular formation through the mechanism of photoassociation of a two-species atomic Bose-Einstein condensate confined in a double-well potential. The double-well potential can be generated experimentally by a magnetic harmonic trap and a center barrier,which was formed using a blue-detuned laser beam or a radio-frequency source. For different preparations of the initial atoms and in the presence of appropriate light field,we calculated the short-time quantum dynamics of the system,and studied the mean-field effects numerically. It was found that both the tunneling strength and the initial state of preparation have significant impacts on the dynamic behaviors of the system. The different situations of homonuclear molecular creations and the effects of quantized photoassociation light on atom-molecule transformation are discussed.