Acoustic attenuation probe for fermion superfluidity in ultracold atom gases

Details Acoustic attenuation probe for fermion superfluidity in ultracold atom gases Acoustic attenuation probe for fermion superfluidity in ultracold atom gases

2005-12-07

arxiv.org/abs/cond-mat/0512134v4

Phys. Rev. Lett., 98, 110407 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures. Revised version

Scientific paper

Dilute gas Bose-Einstein condensates (BEC's), currently used to cool fermionic atoms in atom traps, can also probe the superfluidity of these fermions. The damping rate of BEC-acoustic excitations (phonon modes), measured in the middle of the trap as a function of the phonon momentum, yields an unambiguous signature of BCS-like superfluidity, provides a measurement of the superfluid gap parameter and gives an estimate of the size of the Cooper-pairs in the BEC-BCS crossover regime. We also predict kinks in the momentum dependence of the damping rate which can reveal detailed information about the fermion quasi-particle dispersion relation.

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