Universal behavior of pair correlations in a strongly interacting Fermi gas

Details Universal behavior of pair correlations in a strongly interacting Fermi gas Universal behavior of pair correlations in a strongly interacting Fermi gas

2010-01-19

arxiv.org/abs/1001.3200v2

Physics

Condensed Matter

Quantum Gases

Manuscript revised, 4 pages, 3 figures

Scientific paper

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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