共振相互作用下超冷费米气体的相干性和钟移
Coherence and clock shifts in ultracold Fermi gases with resonant interactions
摘要：
利用求和规则，我们得到了费米气体中rf谱线平均位移与原子间相互作用强度和两粒子关联函数的一般关系。我们发现，近相互作用共振位移与原子散射长度成反比，而不是线性的稀释气体，从而占实验观察到的时钟位移保持有限的费什巴赫共振。
英文摘要：
Using arguments based on sum rules, we derive a general result for the average shifts of rf lines in Fermi gases in terms of interatomic interaction strengths and two-particle correlation functions. We show that near an interaction resonance shifts vary inversely with the atomic scattering length, rather than linearly as in dilute gases, thus accounting for the experimental observation that clock shifts remain finite at Feshbach resonances.
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