Papp S B, Pino J M, Wieman C E
JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA.
Phys Rev Lett. 2008 Jul 25;101(4):040402. doi: 10.1103/PhysRevLett.101.040402. Epub 2008 Jul 24.
We report on the observation of controllable phase separation in a dual-species Bose-Einstein condensate with 85Rb and 87Rb. Interatomic interactions between the different components determine the miscibility of the two quantum fluids. In our experiments, we can clearly observe immiscible behavior via a dramatic spatial separation of the two species. Furthermore, a magnetic-field Feshbach resonance is used to change them between miscible and immiscible by tuning the 85Rb scattering length. The spatial density pattern of the immiscible quantum fluids exhibits complex alternating-domain structures that are uncharacteristic of its stationary ground state.
我们报告了在含有85Rb和87Rb的双组分玻色-爱因斯坦凝聚体中可控相分离的观测结果。不同组分之间的原子间相互作用决定了这两种量子流体的互溶性。在我们的实验中，通过两种组分的显著空间分离，我们能够清晰地观测到不互溶行为。此外，利用磁场费什巴赫共振，通过调节85Rb的散射长度，使它们在互溶和不互溶状态之间转变。不互溶量子流体的空间密度图案呈现出复杂的交替畴结构，这与其静止基态不同。
