$^{87}$ Rb和$^{133}$ Cs的双组分玻色-爱因斯坦凝聚体
Dual-Species Bose-Einstein Condensate of $^{87}$Rb and $^{133}$Cs
摘要：
本文报道了在相同的俘获势下$^{87}$ Rb和$^{133}$ Cs的双组分玻色-爱因斯坦凝聚体的形成。我们的方法利用有效的交感冷却$^{133}$ Cs通过弹性碰撞与$^{87}$ Rb，最初在磁四极阱，随后在悬浮的光阱。这两种缩合物各自含有多达$2\times10^{4}$原子，并表现出惊人的相分离，揭示了混合物是不混溶的，由于强烈的排斥种间相互作用。在冷却过程中牺牲所有的$^{87}$ Rb，我们创建高达$6\times10^{4}$原子的单一物种$^{133}$ Cs冷凝物。
英文摘要：
We report the formation of a dual-species Bose-Einstein condensate of $^{87}$Rb and $^{133}$Cs in the same trapping potential. Our method exploits the efficient sympathetic cooling of $^{133}$Cs via elastic collisions with $^{87}$Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. The two condensates each contain up to $2\times10^{4}$ atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the $^{87}$Rb during the cooling, we create single species $^{133}$Cs condensates of up to $6\times10^{4}$ atoms.
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