Zwierlein M W, Stan C A, Schunck C H, Raupach S M F, Gupta S, Hadzibabic Z, Ketterle W
Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2003 Dec 19;91(25):250401. doi: 10.1103/PhysRevLett.91.250401. Epub 2003 Dec 15.
We have observed Bose-Einstein condensation of molecules. When a spin mixture of fermionic 6Li atoms was evaporatively cooled in an optical dipole trap near a Feshbach resonance, the atomic gas was converted into 6Li2 molecules. Below 600 nK, a Bose-Einstein condensate of up to 900 000 molecules was identified by the sudden onset of a bimodal density distribution. This condensate realizes the limit of tightly bound fermion pairs in the crossover between BCS superfluidity and Bose-Einstein condensation.
我们观测到了分子的玻色-爱因斯坦凝聚。当费米子6Li原子的自旋混合物在靠近费什巴赫共振的光学偶极阱中通过蒸发冷却时，原子气体被转化为6Li2分子。在600 nK以下，通过双峰密度分布的突然出现，识别出了多达900000个分子的玻色-爱因斯坦凝聚。这种凝聚实现了在BCS超流性与玻色-爱因斯坦凝聚交叉区域中紧密束缚费米子对的极限情况。
