Pairing gaps in atomic gases at the BCS-BEC crossover

Details Pairing gaps in atomic gases at the BCS-BEC crossover Pairing gaps in atomic gases at the BCS-BEC crossover

2004-06-29

arxiv.org/abs/cond-mat/0406714v3

New J. of Physics 6, 137 (2004)

Physics

Condensed Matter

Superconductivity

revised version: including damping, resonance position typo corrected

Scientific paper

10.1088/1367-2630/6/1/137

Strong evidence for pairing and superfluidity has recently been found in atomic Fermi gases at the BCS-BEC crossover both in collective modes and RF excitation energies. It is argued that the scale for the effective pairing gaps measured in RF experiments is set by the lowest quasiparticle in-gap excitation energies. These are calculated at the BCS-BEC crossover from semiclassical solutions to the Bogoliubov-deGennes equations. The strong damping of the radial breathing mode observed in the BCS limit occur when the lowest quasiparticle excitation energies coincide with the radial frequency, which indicates that a coupling between them take place.

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