Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-12-07
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.
Bedell Kevin S.
Blagoev Krastan B.
Gaudio Sergio
Mihaila Bogdan
Timmermans Eddy
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