Mixing of 0 + ?> and 0 − ?> observed in the hyperfine and Zeeman structure of ultracold Rb 2 ?> molecules
Mixing of 0 + ?> and 0 − ?> observed in the hyperfine and Zeeman structure of ultracold Rb 2 ?> molecules
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DOI：
10.1088/1367-2630/17/8/083032
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发表时间：
2015-05
影响因子：
3.3
通讯作者：
M. Deiss;Bjorn Drews;J. Denschlag;E. Tiemann
中科院分区：
文献类型：
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作者：
M. Deiss;Bjorn Drews;J. Denschlag;E. Tiemann
我们研究了自旋-轨道耦合a1 &Sgr中超精细结构和塞曼结构的结合。u + - b 3 &Pgr；u ?> 87 Rb 2 ？>。为此，在磁场B = 1000 ？>g执行。我们驱动光学偶极子跃迁，从一个超冷的费什巴赫分子的最低旋转状态到不同的振动水平，0 + ？A - b的>对称性？>复杂。与先前的旋转激发碱二聚体的测量相反，我们没有观察到超精细水平的等距。此外，光谱在不同的振动量子数下变化很大，并表现出高达160 ？>兆赫，意外为0 + ？>。能级结构被解释为状态0 + ？>和0−？> of b3 &Pgr；u ?>，通过超精细和塞曼相互作用耦合。一般来说，0−？>和0 + ？>有一个自旋轨道诱导的能量间隔Δ，对于不同的振动状态是不同的。从每个测量的光谱中，我们能够提取Δ，否则在传统的光谱方案中不容易获得。我们得到Δ的值在±100 ？如果引入自旋轨道耦合，则可以用耦合信道计算来描述，该自旋轨道耦合与0−？>和0 + ？> of b3 &Pgr；u ?>。
We study the combination of the hyperfine and Zeeman structure in the spin–orbit coupled A 1 &Sgr; u + − b 3 &Pgr; u ?> complex of 87 Rb 2 ?> . For this purpose, absorption spectroscopy at a magnetic field around B = 1000 ?> G is carried out. We drive optical dipole transitions from the lowest rotational state of an ultracold Feshbach molecule to various vibrational levels with 0 + ?> symmetry of the A − b ?> complex. In contrast to previous measurements with rotationally excited alkali-dimers, we do not observe equal spacings of the hyperfine levels. In addition, the spectra vary substantially for different vibrational quantum numbers, and exhibit large splittings of up to 160 ?> MHz, unexpected for 0 + ?> states. The level structure is explained to be a result of the repulsion between the states 0 + ?> and 0 − ?> of b 3 &Pgr; u ?> , coupled via hyperfine and Zeeman interactions. In general, 0 − ?> and 0 + ?> have a spin–orbit induced energy spacing Δ, that is different for the individual vibrational states. From each measured spectrum we are able to extract Δ, which otherwise is not easily accessible in conventional spectroscopy schemes. We obtain values of Δ in the range of ± 100 ?> GHz which can be described by coupled channel calculations if a spin–orbit coupling is introduced that is different for 0 − ?> and 0 + ?> of b 3 &Pgr; u ?> .