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arXiv · 1001.3200

Universal behavior of pair correlations in a strongly interacting Fermi gas

E. D. Kuhnle·H. Hu·X. -J. Liu·P. Dyke·M. Mark·P. D. Drummond·P. Hannaford·C. J. Vale
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Abstract

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 $^6$Li 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.

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E. D. Kuhnle, H. Hu, X. -J. Liu, P. Dyke, M. Mark, P. D. Drummond, P. Hannaford, C. J. Vale. 2010-06-28. Universal behavior of pair correlations in a strongly interacting Fermi gas. https://doi.org/10.1103/physrevlett.105.070402

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