Singlet Pathway to the Ground State of Ultracold Polar Molecules.,Physical Review Letters

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Singlet Pathway to the Ground State of Ultracold Polar Molecules.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-04-03 , DOI: 10.1103/physrevlett.124.133203
A Yang ₁ , S Botsi ₁ , S Kumar ₁ , S B Pal ₁ , M M Lam ₁ , I Čepaitė ₁ , A Laugharn ₁ , K Dieckmann _{1,

2}

Affiliation

Starting from weakly bound Feshbach molecules, we demonstrate a two-photon pathway to the dipolar ground state of bi-alkali molecules that involves only singlet-to-singlet optical transitions. This pathway eliminates the search for a suitable intermediate state with sufficient singlet-triplet mixing and the exploration of its hyperfine structure, as is typical for pathways starting from triplet dominated Feshbach molecules. By selecting a Feshbach state with a stretched singlet hyperfine component and controlling the laser polarizations, we assure coupling to only single hyperfine components of the A^{1}Σ^{+} excited potential and the X^{1}Σ^{+} rovibrational ground state. In this way an ideal three level system is established, even if the hyperfine structure is not resolved. We demonstrate this pathway with ^{6}Li^{40}K molecules, and discuss its application to other important molecular species.

中文翻译：

超冷极分子基态的单重态途径。

从弱结合的Feshbach分子开始，我们证明了双光子到达双碱分子偶极基态的双光子途径，仅涉及单重态到单态的光学跃迁。这种途径消除了对具有足够的单重态-三重态混合的合适中间态的搜索，并消除了其超精细结构的探索，这是从三重态占主导地位的Feshbach分子开始的典型途径。通过选择具有拉伸的单重态超精细分量的Feshbach态并控制激光偏振，我们确保仅耦合到A ^ {1}Σ^ {+}激发电势和X ^ {1}Σ^ {+振动基态。这样，即使没有解析超精细结构，也可以建立理想的三级系统。我们用^ {6} Li ^ {40} K分子证明了这种途径，

更新日期：2020-04-01

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