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arXiv 0906.4378cond-mat.quant-gas
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三组分费米气体中的普适三聚体

A Universal Trimer in a Three-Component Fermi Gas

A. N. Wenz, T. Lompe, T. B. Ottenstein, F. Serwane, G. Zürn, S. Jochim

摘要:

我们表明,最近测量的超冷$^6$ Li原子三组分混合物中三体损耗的磁场依赖性[1,2]可以通过普遍三聚体状态的存在来解释。以前的工作提出了一个普遍的三聚体状态作为一个可能的解释,但未能在整个磁场范围内得到良好的理论和实验之间的协议。在我们的描述中,我们将Braaten和Hammer [3]关于三个全同玻色子的理论应用于三个可区分费米子的情况,方法是将三个组分之间的三个散射长度$a_{12},$、$a_{23}$和$a_{13}$组合成一个有效相互作用参数$a_m$。我们表明,考虑到磁场变化的三聚体状态的寿命是必不可少的,以获得一个完整的理解所观察到的衰变率。

英文摘要:

We show that the recently measured magnetic field dependence of three-body loss in a three-component mixture of ultracold $^6$Li atoms [1,2] can be explained by the presence of a universal trimer state. Previous work suggested a universal trimer state as a probable explanation, yet failed to get good agreement between theory and experiment over the whole range of magnetic fields. For our description we adapt the theory of Braaten and Hammer [3] for three identical bosons to the case of three distinguishable fermions by combining the three scattering lengths $a_{12},$ $a_{23}$ and $a_{13}$ between the three components to an effective interaction parameter $a_m$. We show that taking into account a magnetic field variation of the lifetime of the trimer state is essential to obtain a complete understanding of the observed decay rates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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