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arXiv 0709.4554cond-mat.othercond-mat.soft
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超冷$^6$ Li和$^{87}$ Rb混合气体的费什巴赫共振

Feshbach resonances in mixtures of ultracold $^6$Li and $^{87}$Rb gases

B. Deh, C. Marzok, C. Zimmermann, Ph. W. Courteille

摘要:

报道了超冷$^6$ Li和$^{87}$ Rb原子在各自的超精细基态$|F,m_F>=|1/2,1/2>$和$|1,1>$碰撞中的两个费什巴赫共振.共振表现为$^6$ Li云的陷阱损失的非弹性Li-Rb-Rb三体碰撞诱导。它们出现的磁场值代表了准确测定种间相互作用势的重要基准。位于1066.92 G的宽费什巴赫共振为超冷异质结分子的产生开辟了有趣的前景。此外,我们观察到一个强大的增强的窄p波费什巴赫共振的碰撞$^6$锂原子在158.55 G的存在下,一个密集的$^{87}$ Rb云。$^{87}$ Rb云的作用是引入以比Li-Li-Li碰撞更高的速率发生的Li-Li-Rb三体碰撞。

英文摘要:

We report on the observation of two Feshbach resonances in collisions between ultracold $^6$Li and $^{87}$Rb atoms in their respective hyperfine ground states $|F,m_F>=|1/2,1/2>$ and $|1,1>$. The resonances show up as trap losses for the $^6$Li cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at 1066.92 G opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow p-wave Feshbach resonance in collisions of $^6$Li atoms at 158.55 G in the presence of a dense $^{87}$Rb cloud. The effect of the $^{87}$Rb cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

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