强相互作用费米气体的布拉格光谱
Bragg spectroscopy of a strongly interacting Fermi gas
摘要：
利用布拉格谱对费米$^6$ Li中玻色-爱因斯坦凝聚体到巴丁-库珀-施里弗（BEC-BCS）的交叉进行了全面的研究。从分子光谱到原子光谱的平滑过渡观察到一个明确的签名配对和以上的么正性。这些光谱探测气体的动态和静态结构因素，并提供了一个直接的链接到两体相关性。我们已经描述了这些相关性，并测量了它们在834 G的宽费什巴赫共振中的密度依赖性。
英文摘要：
We present a comprehensive study of the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover in fermionic $^6$Li using Bragg spectroscopy. A smooth transition from molecular to atomic spectra is observed with a clear signature of pairing at and above unitarity. These spectra probe the dynamic and static structure factors of the gas and provide a direct link to two-body correlations. We have characterised these correlations and measured their density dependence across the broad Feshbach resonance at 834 G.
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