论文标题
实现费米原子和锂原子的冷混合物
Realization of a Cold Mixture of Fermionic Chromium and Lithium Atoms
论文作者
论文摘要
我们报告了Fermionic $^{53} $ CR和$^{6} $ li原子的新型冷混合物的生产，该混合物由两个Zeeman-Slowed原子梁传递，并收集在一个磁光陷阱（MOT）中。对于锂，我们在温度约为$ 500 \μ$ k的温度下获得最高$ 4 \，10^8 $原子的云。灰色的光学糖蜜阶段使我们能够将气体温度降低至$ 45（5）\，μ$ k。对于Chromium，我们获得的MOTS最高为$ 1.5 \，10^6 $原子。可磁性的亚稳定性$ D $状态的可用性，从中$ p $ state原子可以辐射衰减，使得可以累积到MOT四螺杆样品中，最高为$ 10^7 $^{53} $ cr原子。将$ d $ state原子放回冷却周期后，最终的冷却阶段将铬温度降低至$ 145（5）\，μ$ k。锂MoT的存在降低了磁诱捕的$^{53} $ cr原子的寿命，但我们在5秒钟的占空比中获得了约$ 4 \，10^6 $ chromium and $ 1.5 \，10^8 $锂原子的样品。我们的工作为生产退化的CR-LI费米混合物提供了至关重要的一步。
We report on the production of a novel cold mixture of fermionic $^{53}$Cr and $^{6}$Li atoms delivered by two Zeeman-slowed atomic beams and collected within a magneto-optical trap (MOT). For lithium, we obtain clouds of up to $4 \,10^8$ atoms at temperatures of about $500\,μ$K. A gray optical molasses stage allows us to decrease the gas temperature down to $45(5)\,μ$K. For chromium, we obtain MOTs comprising up to $1.5\, 10^6$ atoms. The availability of magnetically trappable metastable $D$-states, from which $P$-state atoms can radiatively decay onto, enables to accumulate into the MOT quadrupole samples of up to $10^7$ $^{53}$Cr atoms. After repumping $D$-state atoms back into the cooling cycle, a final cooling stage decreases the chromium temperature down to $145(5)\,μ$K. While the presence of a lithium MOT decreases the lifetime of magnetically trapped $^{53}$Cr atoms, we obtain, within a 5 seconds duty cycle, samples of about $4\, 10^6$ chromium and $1.5\,10^8$ lithium atoms. Our work provides a crucial step towards the production of degenerate Cr-Li Fermi mixtures.
