Probing two-fluid hydrodynamics in a trapped Fermi superfluid at unitarity

Details Probing two-fluid hydrodynamics in a trapped Fermi superfluid at unitarity Probing two-fluid hydrodynamics in a trapped Fermi superfluid at unitarity

2007-09-05

arxiv.org/abs/0709.0698v2

Physics

Condensed Matter

Other Condensed Matter

Figures 1-3 modified, Figure 4 added, minor changes made in text, references updated

Scientific paper

We develop a variational approach to calculate the density response function at finite temperatures of the lowest-lying two-fluid modes in a trapped two-component Fermi superfluid close to a Feshbach resonance. The out-of-phase oscillations, which are the analogue in trapped gases of second sound in uniform superfluids, have so far not been observed in cold-atom experiments. At unitarity, we show that these modes are observable at finite temperatures via two-photon Bragg scattering, whose spectrum is related to the imaginary part of density response function. This provides direct evidence for superfluidity and a promising way to test microscopic results for thermodynamics at unitarity.

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