Bartenstein M, Altmeyer A, Riedl S, Jochim S, Chin C, Denschlag J Hecker, Grimm R
Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria.
Phys Rev Lett. 2004 Mar 26;92(12):120401. doi: 10.1103/PhysRevLett.92.120401. Epub 2004 Mar 23.
We demonstrate a reversible conversion of a 6Li2 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.
我们展示了通过绝热穿过费什巴赫共振将6Li2分子玻色-爱因斯坦凝聚体可逆地转化为简并原子费米气体。通过光学原位成像，我们观察到在交叉区域云团尺寸的平滑变化。在费什巴赫共振处，系综具有强相互作用，测量得到的云团尺寸是无相互作用零温费米气体云团尺寸的75(7)%。超过90%的高凝聚分数以及绝热交叉表明我们的费米气体足够冷以形成超流体。
