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Title: Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas

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/(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.

Authors:
; ; ; ; ;  [1]
  1. ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia)
Publication Date:
OSTI Identifier:
21538295
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevLett.106.170402; (c) 2011 American Institute of Physics; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORRELATIONS; DECAY; FERMI GAS; INTERACTIONS; RESONANCE; S WAVES; SCATTERING LENGTHS; SPECTROSCOPY; SUPERFLUIDITY; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE; VECTORS; DIMENSIONS; LENGTH; PARTIAL WAVES; PHYSICAL PROPERTIES; TENSORS; THERMODYNAMIC PROPERTIES

Citation Formats

Kuhnle, E D, Hoinka, S, Dyke, P, Hu, H, Hannaford, P, and Vale, C J. Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas. United States: N. p., 2011. Web. doi:10.1103/PHYSREVLETT.106.170402.
Kuhnle, E D, Hoinka, S, Dyke, P, Hu, H, Hannaford, P, & Vale, C J. Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas. United States. https://doi.org/10.1103/PHYSREVLETT.106.170402
Kuhnle, E D, Hoinka, S, Dyke, P, Hu, H, Hannaford, P, and Vale, C J. Fri . "Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas". United States. https://doi.org/10.1103/PHYSREVLETT.106.170402.
@article{osti_21538295,
title = {Temperature Dependence of the Universal Contact Parameter in a Unitary Fermi Gas},
author = {Kuhnle, E D and Hoinka, S and Dyke, P and Hu, H and Hannaford, P and Vale, C J},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.106.170402},
url = {https://www.osti.gov/biblio/21538295}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 17,
volume = 106,
place = {United States},
year = {2011},
month = {4}
}