Department of Physics, University of Washington, Seattle, Washington 98195, USA.
Phys Rev Lett. 2011 Apr 15;106(15):153201. doi: 10.1103/PhysRevLett.106.153201. Epub 2011 Apr 11.
We report on the realization of a stable mixture of ultracold lithium and ytterbium atoms confined in a far-off-resonance optical dipole trap. We observe sympathetic cooling of 6Li by 174Yb and extract the s-wave scattering length magnitude |a(6Li-174Yb)|=(13±3)a0 from the rate of interspecies thermalization. Using forced evaporative cooling of 174Yb, we achieve reduction of the 6Li temperature to below the Fermi temperature, purely through interspecies sympathetic cooling.
我们报告了一种稳定的混合超冷锂和镱原子的实现，这些原子被限制在一个远离共振的光偶极阱中。我们观察到 6Li 通过 174Yb 的同情冷却，并从物种间热化的速率中提取出 s 波散射长度大小 |a(6Li-174Yb)|=(13±3)a0。通过对 174Yb 的强制蒸发冷却，我们实现了 6Li 温度的降低，使其低于费米温度，这完全是通过物种间的同情冷却实现的。
