title: Speckle imaging of spin fluctuations in a strongly interacting Fermi gas.
abstract: Spin fluctuations and density fluctuations are studied for a two-component gas of strongly interacting fermions along the Bose-Einstein condensate-BCS crossover. This is done by in situ imaging of dispersive speckle patterns. Compressibility and magnetic susceptibility are determined from the measured fluctuations. This new sensitive method easily resolves a tenfold suppression of spin fluctuations below shot noise due to pairing, and can be applied to novel magnetic phases in optical lattices.
authors.affiliation: MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Christian
authors.initials: C
authors.lastname: Sanner
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Su
authors.forename: Aviv
authors.initials: A
authors.lastname: Keshet
authors.forename: Wujie
authors.initials: W
authors.lastname: Huang
authors.forename: Jonathon
authors.initials: J
authors.lastname: Gillen
authors.forename: Ralf
authors.initials: R
authors.lastname: Gommers
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Ketterle