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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/192985
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- Temperature dependence of the universal contact parameter in a unitary Fermi gas
- Kuhnle, E. D.; Hoinka, S.; Dyke, P.; Hu, H.; Hannaford, P.; Vale, C. J.
- 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/(kFa), where kF is the Fermi wave vector and a is the s-wave scattering length, and the temperature T/TF, where TF 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.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
- Physical Review Letters, Vol. 106, no. 17 (Apr 2011), article no. 170402
- Publication year
- FOR Code(s)
- 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
- Bragg spectroscopy; Contact; Fermi gases; Temperature
- American Physical Society
- Publisher URL
- Copyright © 2011 American Physical Society. Published version of the paper reproduced here for noncommercial use only with the kind permission of the publisher.
- Full text
- Peer reviewed