论文标题
III组原子的磁光陷阱
Magneto-optical trap of a Group III atom
论文作者
论文摘要
我们意识到该元素周期表的主要组III中原子的第一个磁光陷阱。我们选择的原子（indium）没有从其基态过渡到适合激光冷却的； therefore, laser cooling is performed on the $\lvert 5P_{3/2},F=6 \rangle \rightarrow \lvert 5D_{5/2},F=7 \rangle$ transition, where $\lvert 5P_{3/2},F=6 \rangle$ is a long-lived metastable state.我们的陷阱参数的优化导致原子数达到$ 5 \ times10^8 $原子，其温度为1 mk。此外，通过陷阱衰减测量值，我们推断出一体陷阱寿命为12.3 s。这种寿命与背景气体碰撞一致，并表明我们的propumpers已关闭所有泄漏途径。我们还推断出$ 1.6 \ times 10^{-11} \ \ mathrm {cm^3/s} $的两体损失率，与在碱原子中测得的损失率相当。这项工作中所示的技术可以直接应用于其他III组原子，我们的结果为实现这些颗粒的量子退化气体铺平了道路。
We realize the first magneto-optical trap of an atom in main group III of the Periodic Table. Our atom of choice (indium) does not have a transition out of its ground state suitable for laser cooling; therefore, laser cooling is performed on the $\lvert 5P_{3/2},F=6 \rangle \rightarrow \lvert 5D_{5/2},F=7 \rangle$ transition, where $\lvert 5P_{3/2},F=6 \rangle$ is a long-lived metastable state. Optimization of our trap parameters results in atoms numbers as large as $5\times10^8$ atoms with temperatures of order 1 mK. Additionally, through trap decay measurements, we infer a one-body trap lifetime of 12.3 s. This lifetime is consistent with background gas collisions and indicates that our repumpers have closed all leakage pathways. We also infer a two-body loss rate of $1.6\times 10^{-11}\ \mathrm{cm^3/s}$, which is comparable to those measured in alkali atoms. The techniques demonstrated in this work can be straightforwardly applied to other group III atoms, and our results pave the way for realizing quantum degenerate gases of these particles.
