Ferlaino F, De Mirandes E, Roati G, Modugno G, Inguscio M
LENS and Dipartimento di Fisica, Università di Firenze, and INFM, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy.
Phys Rev Lett. 2004 Apr 9;92(14):140405. doi: 10.1103/PhysRevLett.92.140405.
We study the expansion of an atomic Fermi gas interacting attractively with a Bose-Einstein condensate. We observe a slower evolution of the radial-to-axial aspect ratio which reveals the importance of the mutual attraction between the two samples during the first phase of the expansion. For large atom numbers, we also observe a bimodal momentum distribution of the Fermi gas, which reflects the spatial distribution of the mixture in trap. This effect allows us to extract important information on the overlap of the two species across the collapse.
我们研究了与玻色 - 爱因斯坦凝聚体相互吸引作用的原子费米气体的膨胀。我们观察到径向与轴向纵横比的演化较慢，这揭示了在膨胀的第一阶段两个样本之间相互吸引的重要性。对于大量原子，我们还观察到费米气体的双峰动量分布，这反映了混合物在陷阱中的空间分布。这种效应使我们能够提取关于两种物质在坍缩过程中重叠的重要信息。
