Speckle Imaging of Spin Fluctuations in a Strongly Interacting Fermi Gas

Wujie Huang
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Christian Sanner
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Edward J. Su
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Aviv Keshet
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Jonathon Gillen
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Ralf Gommers
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

Wolfgang Ketterle
(MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology)

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 through the Fluctuation-Dissipation theorem. 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.

*This work was supported by NSF and the Office of Naval Research, AFOSR (through the MURI program), and under Army Research Office Grant No. W911NF-07-1-0493 with funds from the DARPA Optical Lattice Emulator program.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DAMOP.L1.19

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Bulletin of the American Physical Society

42nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

Volume 56, Number 5

Monday–Friday, June 13–17, 2011; Atlanta, Georgia

Session L1: Poster Session II (4:00 pm - 6:00 pm)

Abstract: L1.00019 : Speckle Imaging of Spin Fluctuations in a Strongly Interacting Fermi Gas*

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