ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122, Australia.
Phys Rev Lett. 2010 Aug 13;105(7):070402. doi: 10.1103/PhysRevLett.105.070402. Epub 2010 Aug 9.
We show that short-range pair correlations in a strongly interacting Fermi gas follow a simple universal law described by Tan's relations. This is achieved through measurements of the static structure factor which displays a universal scaling proportional to the ratio of Tan's contact to the momentum C/q. Bragg spectroscopy of ultracold 6Li atoms from a periodic optical potential is used to measure the structure factor for a wide range of momenta and interaction strengths, providing broad confirmation of this universal law. We calibrate our Bragg spectra using the f-sum rule, which is found to improve the accuracy of the structure factor measurement.
我们表明，强相互作用费米气体中的短程对关联遵循由 Tan 关系描述的简单普适定律。这是通过测量静态结构因子实现的，该结构因子显示出与 Tan 的接触与动量比 C/q 的比例成正比的普遍标度。利用周期性光势中的超冷 6Li 原子的布拉格光谱，我们测量了广泛动量和相互作用强度范围内的结构因子，广泛证实了这一普遍规律。我们使用 f-和规则校准我们的布拉格光谱，发现这提高了结构因子测量的准确性。
