Dynamic spin response of a strongly interacting Fermi gas

Details Dynamic spin response of a strongly interacting Fermi gas Dynamic spin response of a strongly interacting Fermi gas

2012-03-21

arxiv.org/abs/1203.4657v1

Physics

Condensed Matter

Quantum Gases

5 pages, 2 figures, submitted to Phys. Rev. Lett

Scientific paper

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 provide the first independent measurements of the spin-parallel and spin-antiparallel dynamic and static structure factors and open the way to a complete study of the structure factors at any momentum. At high momentum the spin-antiparallel dynamic structure factor displays a universal high frequency tail, proportional to $\omega^{-5/2}$, where $\hbar \omega$ is the probe energy.

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