Bragg Spectroscopy of Cold Atomic Fermi Gases

Details Bragg Spectroscopy of Cold Atomic Fermi Gases Bragg Spectroscopy of Cold Atomic Fermi Gases

2006-07-13

arxiv.org/abs/cond-mat/0607334v4

PRA 74, 033623 (2006)

Physics

Condensed Matter

Superconductivity

8 pages, 9 figures. Typos corrected. Reference updated

Scientific paper

10.1103/PhysRevA.74.033623

We propose a Bragg spectroscopy experiment to measure the onset of superfluid pairing in ultracold trapped Fermi gases. In particular, we study two component Fermi gases in the weak coupling BCS and BEC limits as well as in the strong coupling unitarity limit. The low temperature Bragg spectrum exhibits a gap directly related to the pair-breaking energy. Furthermore, the Bragg spectrum has a large maximum just below the critical temperature when the gas is superfluid in the BCS limit. In the unitarity regime, we show how the pseudogap in the normal phase leads to a significant suppression of the low frequency Bragg spectrum.

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