Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas
- ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia)
The contact I, introduced by Tan, has emerged as a key parameter characterizing universal properties of strongly interacting Fermi gases. For ultracold Fermi gases near a Feshbach resonance, the contact depends upon two quantities: the interaction parameter 1/(k{sub F}a), where k{sub F} is the Fermi wave vector and a is the s-wave scattering length, and the temperature T/T{sub F}, where T{sub F} is the Fermi temperature. We present the first measurements of the temperature dependence of the contact in a unitary Fermi gas using Bragg spectroscopy. The contact is seen to follow the predicted decay with temperature and shows how pair-correlations at high momentum persist well above the superfluid transition temperature.
- OSTI ID:
- 21538295
- Journal Information:
- Physical Review Letters, Vol. 106, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.106.170402; (c) 2011 American Institute of Physics; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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