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

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(F)a), where k(F) is the Fermi wave ve...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2011-04, Vol.106 (17), p.170402-170402, Article 170402
Main Authors: Kuhnle, E D, Hoinka, S, Dyke, P, Hu, H, Hannaford, P, Vale, C J
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CORRELATIONS
DECAY
DIMENSIONS
FERMI GAS
INTERACTIONS
LENGTH
PARTIAL WAVES
PHYSICAL PROPERTIES
RESONANCE
S WAVES
SCATTERING LENGTHS
SPECTROSCOPY
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
TENSORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VECTORS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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(F)a), where k(F) is the Fermi wave vector and a is the s-wave scattering length, and the temperature T/T(F), where T(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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.170402