Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/192985

Download PDF (Published version) (Adobe Acrobat PDF, -1 bytes)

Title

Temperature dependence of the universal contact parameter in a unitary Fermi gas

Author(s)

Kuhnle, E. D.;  Hoinka, S.;  Dyke, P.;  Hu, H.;  Hannaford, P.;  Vale, C. J.

Abstract

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. Centre of Excellence for Quantum-Atom Optics

Source

Physical Review Letters, Vol. 106, no. 17 (Apr 2011), article no. 170402

Publication year

2011

FOR Code(s)

01 Mathematical Sciences;  02 Physical Sciences;  09 Engineering

Keyword(s)

Bragg spectroscopy;  Contact;  Fermi gases;  Temperature

Publisher

American Physical Society

ISSN

0031-9007

Publisher URL

http://dx.doi.org/10.1103/PhysRevLett.106.170402

Copyright

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