Magnetic Trapping of an Ultracold Gas of Polar Molecules.
Magnetic Trapping of an Ultracold Gas of Polar Molecules.
复制标题
DOI：
10.1103/physrevlett.121.013202
复制
发表时间：
2017-12
影响因子：
8.6
通讯作者：
D. McCarron;M. Steinecker;Yuqi Zhu;D. DeMille
中科院分区：
文献类型：
--
作者：
D. McCarron;M. Steinecker;Yuqi Zhu;D. DeMille
我们演示了分子从磁光陷阱到保守的磁四极陷阱的有效转移。我们的方案首先用蓝色失谐的光学糖蜜将srf分子冷却到≈50μK。接下来，我们将分子光学泵浦到一个强捕获的子能级中。这两个步骤的过程可靠地将最初捕获在磁光陷阱中的≈40%的分子转移到磁陷阱中的单个量子态。一旦被加载，分子云就会通过增加磁场梯度来压缩。我们观测到一个超过1 S的磁陷阱寿命。这为研究超冷分子碰撞开辟了一条很有希望的新途径，并有可能通过与共陷态原子的共鸣冷却来产生量子简并分子气体。
We demonstrate the efficient transfer of molecules from a magneto-optical trap into a conservative magnetic quadrupole trap. Our scheme begins with a blue-detuned optical molasses to cool SrF molecules to ≈50 μK. Next, we optically pump the molecules into a strongly trapped sublevel. This two-step process reliably transfers ≈40% of the molecules initially trapped in the magneto-optical trap into a single quantum state in the magnetic trap. Once loaded, the molecule cloud is compressed by increasing the magnetic field gradient. We observe a magnetic trap lifetime of over 1 s. This opens a promising new path to study ultracold molecular collisions, and potentially to produce quantum-degenerate molecular gases via sympathetic cooling with co-trapped atoms.