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arXiv 2008.05439cond-mat.quant-gasphysics.atom-ph
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玻色$^{23}\textrm{Na}^{39}\textrm{K}$基态分子的超冷气体

An Ultracold Gas of Bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ Ground-State Molecules

Kai K. Voges, Philipp Gersema, Mara Meyer zum Alten Borgloh, Torben A. Schulze, Torsten Hartmann, Alessandro Zenesini, Silke Ospelkaus

摘要:

我们报道了超冷玻色子偶极$^{23}\textrm{Na}^{39}\textrm{K}$分子在其绝对振转基态的产生。从弱结合的分子浸没在超冷原子混合物,我们相干转移的二聚体的振转基态使用绝热拉曼通道。我们分析了纯分子样品和分子-原子混合物中的二体衰变,发现分子与$^{39}\textrm{K}$原子在选定的超精细状态下碰撞的二体衰变系数出乎意料地低。玻色子$^{23}\textrm{Na}^{39}\textrm{K}$分子的制备为将来相同化学物种的费米子和玻色子超冷基态分子之间的比较开辟了道路。

英文摘要:

We report the creation of ultracold bosonic dipolar $^{23}\textrm{Na}^{39}\textrm{K}$ molecules in their absolute rovibrational ground state. Starting from weakly bound molecules immersed in an ultracold atomic mixture, we coherently transfer the dimers to the rovibrational ground state using an adiabatic Raman passage. We analyze the two-body decay in a pure molecular sample and in molecule-atom mixtures and find an unexpectedly low two-body decay coefficient for collisions between molecules and $^{39}\textrm{K}$ atoms in a selected hyperfine state. The preparation of bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ molecules opens the way for future comparisons between fermionic and bosonic ultracold ground-state molecules of the same chemical species.

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