Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
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DOI：
10.1103/physrevlett.92.120401
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发表时间：
2004-03-26
影响因子：
8.6
通讯作者：
Grimm, R
中科院分区：
文献类型：
--
作者：
Bartenstein, M;Altmeyer, A;Grimm, R
我们证明了 (6)Li(2) 分子玻色-爱因斯坦凝聚态通过绝热穿过费什巴赫共振可逆转化为原子的简并费米气体。通过光学原位成像，我们观察到交叉区域云大小的平滑变化。在费什巴赫共振中，系综具有强烈的相互作用，测量到的云大小是非相互作用零温费米气体云大小的 75(7)%。超过 90% 的高凝结物分数和绝热交叉表明我们的费米气体足够冷以形成超流体。
We demonstrate a reversible conversion of a (6)Li(2) molecular Bose-Einstein condensate to a degenerate Fermi gas of atoms by adiabatically crossing a Feshbach resonance. By optical in situ imaging, we observe a smooth change of the cloud size in the crossover regime. On the Feshbach resonance, the ensemble is strongly interacting and the measured cloud size is 75(7)% of the one of a noninteracting zero-temperature Fermi gas. The high condensate fraction of more than 90% and the adiabatic crossover suggest our Fermi gas to be cold enough to form a superfluid.