Observation of resonant dipolar collisions in ultracold Na23Rb87 rotational mixtures

Observation of resonant dipolar collisions in ultracold Na23Rb87 rotational mixtures
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超冷 Na23Rb87 旋转混合物中共振偶极碰撞的观察

DOI:
10.1103/physrevresearch.3.013016
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发表时间:
2019
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
Dajun Wang
Dajun Wang
中科院分区:
--
文献类型:
--
作者:
Junyu He;X. Ye;Junyu Lin;Mingyang Guo;G. Qu'em'ener;Dajun Wang

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报道了超冷玻色子$^{23}$Na$^{87}$Rb分子转动态混合物中偶极碰撞的研究.在相反宇称的旋转状态下,分子之间的大共振偶极-偶极相互作用对它们的碰撞产生了显著的改变,即使在没有电场的情况下也是如此。在这项工作中,这种效果是通过测量显着增强的两体损失速率常数的混合物。此外,偶极相互作用强度可以通过制备不同转动能级的NaRb混合物来调节。当转动能级组合不是最低能量时,也观察到超精细变化碰撞的贡献。我们测得的损耗速率常数与量子密耦计算,我们也提出了充分的细节是在很好的协议。
We report the investigation on dipolar collisions in rotational state mixtures of ultracold bosonic $^{23}$Na$^{87}$Rb molecules. The large resonant dipole-dipole interaction between molecules in rotational states of opposite parities brings about significant modifications to their collisions, even when an electric field is not present. In this work, this effect is revealed by measuring the dramatically enhanced two-body loss rate constants in the mixtures. In addition, the dipolar interaction strength can be tuned by preparing the NaRb mixture in different rotational levels with microwave spectroscopy. When the rotational level combination is not of the lowest energy, contributions from hyperfine changing collisions are also observed. Our measured loss rate constants are in good agreement with a quantum close-coupling calculation which we also present in full detail.
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