Hyperfine energy levels of alkali-metal dimers: Ground-state homonuclear molecules in magnetic fields
Hyperfine energy levels of alkali-metal dimers: Ground-state homonuclear molecules in magnetic fields
复制标题
碱金属二聚体的超精细能级：磁场中的基态同核分子
DOI：
10.1103/physreva.79.013401
复制
发表时间：
2009
影响因子：
2.9
通讯作者：
Aldegunde J
中科院分区：
文献类型：
--
作者：
Aldegunde J
我们研究了同素碱金属二聚体在低位转动和振动态的超精细能级和塞曼分裂，这对于设计用于产生深度束缚分子的量子气体的实验是重要的。我们进行了核超精细耦合常数的密度泛函理论计算。对于非旋转态，零场分裂几乎完全由标量核自旋-自旋耦合常数决定。与异质情况相比，在磁场中，核的总自旋仍然是一个好的量子数。我们还研究了具有转动量子数的能级，这些能级具有长程各向异性四极-四极相互作用，并且可能是碰撞稳定的。对于这些状态的分裂是占主导地位的核四极耦合的碱金属二聚体和塞曼分裂是相当复杂的。
We investigate the hyperfine energy levels and Zeeman splittings for homonuclear alkali-metal dimers in low-lying rotational and vibrational states, which are important for experiments designed to produce quantum gases of deeply bound molecules. We carry out density-functional theory calculations of the nuclear hyperfine coupling constants. For nonrotating states, the zero-field splittings are determined almost entirely by the scalar nuclear spin-spin coupling constant. By contrast with the heteronuclear case, the total nuclear spin remains a good quantum number in a magnetic field. We also investigate levels with rotational quantum number, which have long-range anisotropic quadrupole-quadrupole interactions and may be collisionally stable. For these states the splitting is dominated by nuclear quadrupole coupling for most of the alkali-metal dimers and the Zeeman splittings are considerably more complicated.