论文标题
CS和YB的量子退化混合物
Quantum Degenerate Mixtures of Cs and Yb
论文作者
论文摘要
我们报告了CS和YB的量子退化的bose-bose混合物的产生，并具有有吸引力的（CS + $^{174} $ YB）和排斥性（CS + $^{170} $ YB）交互。双物种蒸发是在双重光学偶极子陷阱中进行的，该双极偶极子陷阱在1070 nm和532 nm处结合了光，以控制CS和YB的相对陷阱深度。在整个蒸发过程中保持YB较浅的陷阱会导致CS高效地对CS的同位素组合，在CS三体重组率接近Efimov的两种同位素组合中，在22 g左右的CS三体重组速率。 \ times 10^4 $和$ n_ \ mathrm {cs} \ sim 5 \ times 10^3 $。我们发现，有吸引力的种间相互作用（以散射长度$ a_ \ mathrm {csyb} = -75 \，a_0 $为特征）稳定了排斥性的内在相互作用。对于CS + $^{170} $ yb，我们生产典型的原子数为$ n_ \ mathrm {yb} \ sim 4 \ times 10^4 $和$ n_ \ mathrm {cs} \ sim 1 \ sim 1 \ times 10^4 $。在这里，排斥的种间交互（$ a_ \ mathrm {csyb} = 96 \，a_0 $）可以压倒种内相互作用的交互，因此混合物位于部分混乱的区域中。
We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive (Cs + $^{174}$Yb) and repulsive (Cs + $^{170}$Yb) interspecies interactions. Dual-species evaporation is performed in a bichromatic optical dipole trap that combines light at 1070 nm and 532 nm to enable control of the relative trap depths for Cs and Yb. Maintaining a trap which is shallower for Yb throughout the evaporation leads to highly efficient sympathetic cooling of Cs for both isotopic combinations at magnetic fields close to the Efimov minimum in the Cs three-body recombination rate at around 22 G. For Cs + $^{174}$Yb, we produce quantum mixtures with typical atom numbers of $N_\mathrm{Yb} \sim 5 \times 10^4$ and $N_\mathrm{Cs} \sim 5 \times 10^3$. We find that the attractive interspecies interaction (characterised by the scattering length $a_\mathrm{CsYb} = -75\,a_0$) is stabilised by the repulsive intraspecies interactions. For Cs + $^{170}$Yb, we produce quantum mixtures with typical atom numbers of $N_\mathrm{Yb} \sim 4 \times 10^4$, and $N_\mathrm{Cs} \sim 1 \times 10^4$. Here, the repulsive interspecies interaction ($a_\mathrm{CsYb} = 96\,a_0$) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility.
