QUIC阱中紧束缚状态下^(87)Rb原子气体的玻色-爱因斯坦凝聚体相变的直接观测  

Direct observation of Bose-Einstein condensation transition in ～(87)Rb atomic gases in tightly confinement QUIC trap

作　　者：徐震[1] 周蜀渝[1] 屈求智[1] 刘华[1] 周善钰[1] 王育竹[1] 

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800

出　　处：《物理学报》2006年第11期5643-5647,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10334050);国家重点基础研究发展计划项目(批准号:2001CB309307)资助的课题.~~

摘　　要：在QUIC阱中经蒸发冷却获得了2×105个|F=2,mF=2〉态的87Rb原子气体的玻色-爱因斯坦凝聚.验证了紧束缚状态下原子云的轴向尺寸的变化作为BEC相变的判据,观察了从热原子气体到玻色-爱因斯坦凝聚的相变过程,测量了自由膨胀过程中BEC的纵横比变化,并和理论预言进行了对比.By evaporative cooling in QUIC trap, Bose-Einstein condensate （BEC） was achieved with 2 ×10^587^Rb atoms in ｜ F = 2, mF = 2） state. We have demonstrated the criterion of BEC transition by the variation of the axial size of the atoms in tight confinement, and observed phase transition from thermal atomic gases to Bose-Einstein condensate, and measured the shift of aspect ratio of BEC during free expansion, which compared with theoretical prediction.

关 键 词：玻色-爱因斯坦凝聚 激光冷却与囚禁 

分 类 号：O431.2[机械工程—光学工程]