Department of Physics, University of Washington, Seattle, Washington 98195, USA.
Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA.
Phys Rev Lett. 2014 Jan 24;112(3):033201. doi: 10.1103/PhysRevLett.112.033201. Epub 2014 Jan 23.
We report on the realization of an ultracold mixture of lithium atoms in the ground state and ytterbium atoms in an excited metastable (3P2) state. Such a mixture can support broad magnetic Feshbach resonances which may be utilized for the production of ultracold molecules with an electronic spin degree of freedom, as well as novel Efimov trimers. We investigate the interaction properties of the mixture in the presence of an external magnetic field and find an upper limit for the background interspecies two-body inelastic decay coefficient of K2'<3×10(-12) cm3/s for the 3P2 mJ=-1 substate. We calculate the dynamic polarizabilities of the Yb(3P2) magnetic substates for a range of wavelengths, and find good agreement with our measurements at 1064 nm. Our calculations also allow the identification of magic frequencies where Yb ground and metastable states are identically trapped and the determination of the interspecies van der Waals coefficients.
我们报告了一种基态锂原子和激发亚稳态（3P2）态 ytterbium 原子的超冷混合物的实现。这种混合物可以支持广泛的磁 Feshbach 共振，可用于产生具有电子自旋自由度的超冷分子，以及新的 Efimov 三聚体。我们在存在外磁场的情况下研究了混合物的相互作用特性，并为 3P2 mJ=-1 亚态的背景相间两体非弹性衰减系数 K2'<3×10(-12) cm3/s 找到了一个上限。我们计算了一系列波长下 Yb(3P2)磁亚稳态的动态极化率，并发现与我们在 1064nm 处的测量结果吻合良好。我们的计算还可以识别 Yb 基态和亚稳态被相同捕获的魔法频率，并确定相间的范德华系数。
