Department of Physics and Astronomy, Rice University, Houston, Texas, 77251, USA.
Phys Rev Lett. 2010 Jul 16;105(3):030402. doi: 10.1103/PhysRevLett.105.030402. Epub 2010 Jul 13.
We report quantum degeneracy in a gas of ultracold fermionic (87)Sr atoms. By evaporatively cooling a mixture of spin states in an optical dipole trap for 10.5 s, we obtain samples well into the degenerate regime with T/T(F)=0.26(-0.06)(+0.05). The main signature of degeneracy is a change in the momentum distribution as measured by time-of-flight imaging, and we also observe a decrease in evaporation efficiency below T/T(F) ∼0.5.
我们报告了超冷费米子（87）Sr 原子气体中的量子简并。通过在光偶极阱中对自旋态混合物进行 10.5 秒的蒸发冷却，我们获得了处于简并态的样品，其温度与费米温度之比 T/T(F)=0.26(-0.06)(+0.05)。简并的主要特征是飞行时间成像测量的动量分布的变化，我们还观察到在 T/T(F) ∼0.5 以下蒸发效率的降低。
