Local observation of pair condensation in a Fermi gas at unitarity

We present measurements of the local (homogeneous) density-density response function of a Fermi gas at unitarity using spatially resolved Bragg spectroscopy. By analyzing the Bragg response across one axis of the cloud, we extract the response function for a uniform gas which shows a clear signature...

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Bibliographic Details
Published inPhysical review letters Vol. 112; no. 10; p. 100404
Main Authors Lingham, M G, Fenech, K, Hoinka, S, Vale, C J
Format Journal Article
LanguageEnglish
Published United States 14.03.2014
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Summary:We present measurements of the local (homogeneous) density-density response function of a Fermi gas at unitarity using spatially resolved Bragg spectroscopy. By analyzing the Bragg response across one axis of the cloud, we extract the response function for a uniform gas which shows a clear signature of the Bose-Einstein condensation of pairs of fermions when the local temperature drops below the superfluid transition temperature. The method we use for local measurement generalizes a scheme for obtaining the local pressure in a harmonically trapped cloud from the line density and can be adapted to provide any homogeneous parameter satisfying the local density approximation.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.112.100404