Quantum degenerate mixtures of Cs and Yb
Quantum degenerate mixtures of Cs and Yb
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DOI：
10.1103/physreva.103.033306
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
K. Wilson;A. Guttridge;Jack Segal;S. Cornish
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文献类型：
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作者：
K. Wilson;A. Guttridge;Jack Segal;S. Cornish
我们报道了Cs和Yb的量子简并玻色-玻色混合物的产生，它们具有吸引（Cs + $^{174}$Yb）和排斥（Cs + $^{170}$Yb）种间相互作用。双物种蒸发在双色光学偶极子阱中进行，该阱结合了1070 nm和532 nm的光，以控制Cs和Yb的相对阱深度。在整个蒸发过程中，保持Yb较浅的阱导致两种同位素组合在接近Efimov最小值的磁场下（约为22 g）对Cs进行高效的共感冷却。对于Cs + $^{174}$Yb，我们产生了典型原子序数为$N_\ mathm {Yb} \sim 5 \乘10^4$和$N_\ mathm {Cs} \sim 5 \乘10^3$的量子混合物。我们发现吸引的种间相互作用（以散射长度$a_\ mathm {CsYb} = -75\,a_0$为特征）被排斥的种内相互作用所稳定。对于Cs + $^{170}$Yb，我们产生了典型原子序数为$N_\ mathm {Yb} \sim 4 \乘10^4$和$N_\ mathm {Cs} \sim 1 \乘10^4$的量子混合物。在这里，互斥的种间相互作用（$a_\ mathm {CsYb} = 96\,a_0$）可以压倒种内相互作用，使得混合物位于部分混溶区域。
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.