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arXiv 0908.0789quant-ph
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三态费米气体中基态和激发态Efimov三聚体存在的证据

Evidence for Ground- and Excited-State Efimov Trimers in a Three-State Fermi Gas

J. R. Williams, E. L. Hazlett, J. H. Huckans, R. W. Stites, Y. Zhang, K. M. O'Hara

摘要:

我们观察到增强的三体复合在超冷的三组分$^6$锂费米气体与大,但不平等的散射长度归因于一个激发的Efimov三聚体状态附近的三原子散射阈值。我们发现测量的三体复合率和零程近似计算的复合率之间的良好协议,其中唯一的自由参数是Efimov参数$κ_*$和$η_*$。由我们在895 G观察到的Efimov共振的位置确定的\cite{Jochim08,OHara09}的值也预测了先前在130和500 G附近观察到的损失特征的位置,这表明所有三个特征都与通用Efimov三聚体状态相关。我们还报道了具有近似SU(3)对称性的量子简并三态费米气体的首次实现。

英文摘要:

We observe enhanced three-body recombination in an ultracold three-component $^6$Li Fermi gas with large but unequal scattering lengths attributable to an excited Efimov trimer state near the three-atom scattering threshold. We find excellent agreement between the measured three-body recombination rate and the recombination rate calculated in the zero-range approximation where the only free parameters are the Efimov parameters $κ_*$ and $η_*$. The value of $κ_*$ determined by the location of the Efimov resonance we observe at 895 G also predicts the locations of loss features previously observed near 130 and 500 G \cite{Jochim08,OHara09} suggesting that all three features are associated with universal Efimov trimer states. We also report on the first realization of a quantum degenerate three-state Fermi gas with approximate SU(3) symmetry.

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