Role of the intraspecies scattering length in the Efimov scenario with large mass difference
Role of the intraspecies scattering length in the Efimov scenario with large mass difference
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DOI：
10.1103/physreva.95.062708
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发表时间：
2017-01
影响因子：
2.9
通讯作者：
S. Hafner;J. Ulmanis;E. Kuhnle;Yujun Wang;C. Greene;M. Weidemuller
中科院分区：
文献类型：
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作者：
S. Hafner;J. Ulmanis;E. Kuhnle;Yujun Wang;C. Greene;M. Weidemuller
我们从实验和理论上研究了种内散射长度对异核Efimov情景的影响，延续了我们早先在超冷Cs-Li混合物中观察到的负Efimov共振[Pires等人，Phys.莱特牧师。250404(2014年)]和正Cs-Cs散射长度[Ulmanis等人，Phys.莱特牧师。117,153201(2016年)]。用三种增加复杂性的理论模型来量化它对标度因子和三体参数的影响：简单的Born-Oppenheimer图、零程理论和无自旋范德华模型。将这些模型与在843G和889G的两个Cs-Li Feshbach共振附近的玻色子Cs和费米子Li原子的超冷混合物中观察到的Efimov共振进行了比较，这两个共振具有不同的Cs-Cs相互作用的符号和大小。通过改变种内散射长度的符号和大小，确定了三体损失率的不同标度行为，定性地与理论预测一致。种内散射长度对三体损失率有很大影响。
We experimentally and theoretically study the effect of the intraspecies scattering length onto the heteronuclear Efimov scenario, following up on our earlier observation of Efimov resonances in an ultracold Cs-Li mixture for negative [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] and positive Cs-Cs scattering length [Ulmanis et al., Phys. Rev. Lett. 117, 153201 (2016)]. Three theoretical models of increasing complexity are employed to quantify its influence on the scaling factor and the three-body parameter: a simple Born-Oppenheimer picture, a zero-range theory, and a spinless van der Waals model. These models are compared to Efimov resonances observed in an ultracold mixture of bosonic $^{133}$Cs and fermionic $^6$Li atoms close to two Cs-Li Feshbach resonances located at 843 G and 889 G, characterized by different sign and magnitude of the Cs-Cs interaction. By changing the sign and magnitude of the intraspecies scattering length different scaling behaviors of the three-body loss rate are identified, in qualitative agreement with theoretical predictions. The three-body loss rate is strongly influenced by the intraspecies scattering length.