具有可调相互作用的双粒子BEC的研究
Studying a dual-species BEC with tunable interactions
摘要：
报道了在含$^{85}$ Rb和$^{87}$ Rb的双粒子玻色-爱因斯坦凝聚体（BEC）中观测到的可控空间分离.不同组分之间的粒子间相互作用可以改变两种量子流体的相容性。在我们的实验中，我们清楚地观察到两个同时玻色凝聚物种通过其空间分离的不混溶性质。此外，通过调节$^{85}$ Rb的散射长度，利用155 G附近的$^{85}$ Rb费什巴赫共振实现了在互溶和不互溶之间的转换.我们的设备也能够创建$^{85}$ Rb缩合物与高达$8\times10^4$原子，这代表了一个显着的改进，在以前的工作。
英文摘要：
We report on the observation of controllable spatial separation in a dual-species Bose-Einstein condensate (BEC) with $^{85}$Rb and $^{87}$Rb. Interparticle interactions between the different components can change the miscibility of the two quantum fluids. In our experiments, we clearly observe the immiscible nature of the two simultaneously Bose-condensed species via their spatial separation. Furthermore the $^{85}$Rb Feshbach resonance near 155 G is used to change them between miscible and immiscible by tuning the $^{85}$Rb scattering length. Our apparatus is also able to create $^{85}$Rb condensates with up to $8\times10^4$ atoms which represents a significant improvement over previous work.
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