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- Dynamic spin response of a strongly interacting Fermi gas
- Hoinka, S.; Lingham, M.; Delehaye, M.; Vale, C. J.
- We present an experimental investigation of the dynamic spin response of a strongly interacting Fermi gas using Bragg spectroscopy. By varying the detuning of the Bragg lasers, we show that it is possible to measure the response in the spin and density channels separately. At low Bragg energies, the spin response is suppressed due to pairing, whereas the density response is enhanced. These experiments yield the first independent measurements of the spin-parallel and spin-antiparallel dynamic and static structure factors, which provide insight into the different features of density and spin response functions. At high momentum the spin-antiparallel dynamic structure factor displays a universal high frequency tail, proportional to ω^-5/2, where ℏω is the probe energy.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
- Physical Review Letters, Vol. 109, no. 5 (Aug 2012), article no. 050403
- Publication year
- FOR Code(s)
- 02 Physical Sciences
- Condensate properties; Electron gas; Fermi gases; Fermion systems; Ultracold gases
- American Physical Society
- Publisher URL
- Copyright © 2012 American Physical Society. The published version is reproduced with the kind permission of the publisher.
- Additional information
- Supported by the Australian Research Council.
- Full text
- Peer reviewed