Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy

Details Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy

2008-07-31

arxiv.org/abs/0808.0026v2

Physics

Condensed Matter

Other Condensed Matter

5 pages, 4 figures (appendix: 3 pages, 5 figures)

Scientific paper

10.1103/PhysRevLett.101.140403

We present majority and minority radiofrequency (RF) spectra of strongly interacting imbalanced Fermi gases of Li-6. We observed a smooth evolution in the nature of pairing correlations from pairing in the superfluid region to polaron binding in the highly polarized normal region. The imbalance induces quasiparticles in the superfluid region even at very low temperature. This leads to a local bimodal spectral response, which allows us to determine the superfluid gap \Delta and the Hartree energy U.

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