Contact and Sum Rules in a Near-Uniform Fermi Gas at Unitarity

C. Carcy, S. Hoinka, M. G. Lingham, P. Dyke, C. C.N. Kuhn, H. Hu, C. J. Vale

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


We present an experimental study of the high-energy excitation spectra of unitary Fermi gases. Using focused beam Bragg spectroscopy, we locally probe atoms in the central region of a harmonically trapped cloud where the density is nearly uniform, enabling measurements of the dynamic structure factor for a range of temperatures both below and above the superfluid transition. Applying sum rules to the measured Bragg spectra, we resolve the characteristic behavior of the universal contact parameter, C, across the superfluid transition. We also employ a recent theoretical result for the kinetic (second-moment) sum rule to obtain the internal energy of gases at unitarity.

Original languageEnglish
Article number203401
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 23 May 2019
Externally publishedYes


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