论文标题
$^{23} $ na $^{40} $ k分子和$^{40} $ k Atoms的量子退化混合物的准备
Preparation of a quantum degenerate mixture of $^{23}$Na$^{40}$K molecules and $^{40}$K atoms
论文作者
论文摘要
我们报告了$^{23} $ na $^{40} $ k分子和$^{40} $ k Atoms的量子退化混合物的准备。 A deeply degenerate atomic mixture of $^{23}$Na and $^{40}$K atoms with a large number ratio ($N_F/N_B\approx 6$) is prepared by the mode-matching loading of atoms from a cloverleaf-type magnetic trap into a large-volume horizontal optical dipole trap and evaporative cooling in a large-volume three-beam optical偶极陷阱。大约$ 3.0 \ times10^4 $ $^{23} $ na $^{40} $ k地面分子是通过磁相结合创建的，然后是刺激的绝热拉曼通道。分子的2D密度分布适合Fermi-Dirac分布，$ t/t_f \ of Yout.4-0.5 $。在原子分子混合物中，弹性碰撞为分子提供了热化机制。在几十毫秒大于典型的热化时间大的毫秒中，保持分子的变性，这可能是由于Pauli排除原理。 $^{23} $ na $^{40} $ k分子和$^{40} $ k原子的量子退化混合物可用于研究牢固相互作用的原子 - 摩尔分子混合物并准备超低三局部分子气体。
We report on the preparation of a quantum degenerate mixture of $^{23}$Na$^{40}$K molecules and $^{40}$K atoms. A deeply degenerate atomic mixture of $^{23}$Na and $^{40}$K atoms with a large number ratio ($N_F/N_B\approx 6$) is prepared by the mode-matching loading of atoms from a cloverleaf-type magnetic trap into a large-volume horizontal optical dipole trap and evaporative cooling in a large-volume three-beam optical dipole trap. About $3.0\times10^4$ $^{23}$Na$^{40}$K ground-state molecules are created through magneto-association followed by stimulated adiabatic Raman passage. The 2D density distribution of the molecules is fit to the Fermi-Dirac distribution with $T/T_F\approx0.4-0.5$. In the atom-molecule mixture, the elastic collisions provide a thermalization mechanism for the molecules. In a few tens of milliseconds which are larger than the typical thermalization time, the degeneracy of the molecules is maintained, which may be due to the Pauli exclusion principle. The quantum degenerate mixture of $^{23}$Na$^{40}$K molecules and $^{40}$K atoms can be used to study strongly interacting atom-molecule mixtures and to prepare ultracold triatomic molecular gases.
