Condensation of pairs of fermionic atoms near a Feshbach resonance.
Condensation of pairs of fermionic atoms near a Feshbach resonance.
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DOI：
10.1103/physrevlett.92.120403
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发表时间：
2004-03
影响因子：
8.6
通讯作者：
M. Zwierlein;C. Stan;C. Schunck;S. Raupach;A. Kerman;W. Ketterle
中科院分区：
文献类型：
--
作者：
M. Zwierlein;C. Stan;C. Schunck;S. Raupach;A. Kerman;W. Ketterle
我们在超冷~ 6Li气体中观察到费米子原子对在磁场高于Feshbach共振时的玻色-爱因斯坦凝聚，在真空中不存在稳定的~ 6Li ~ 2分子。我们准确地确定了共振的位置为822+/-3 G。分子玻色-爱因斯坦凝聚是在快速磁场斜坡后检测到的，磁场斜坡将近距离的原子对转移到束缚分子中。得到高达80%的冷凝馏分。大的冷凝分数被解释在预先存在的分子，这是准稳定的，甚至以上的两体Feshbach共振由于存在的简并费米气体。
We have observed Bose-Einstein condensation of pairs of fermionic atoms in an ultracold 6Li gas at magnetic fields above a Feshbach resonance, where no stable 6Li2 molecules would exist in vacuum. We accurately determined the position of the resonance to be 822+/-3 G. Molecular Bose-Einstein condensates were detected after a fast magnetic field ramp, which transferred pairs of atoms at close distances into bound molecules. Condensate fractions as high as 80% were obtained. The large condensate fractions are interpreted in terms of preexisting molecules which are quasistable even above the two-body Feshbach resonance due to the presence of the degenerate Fermi gas.