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Dynamics of the BCS-BEC Crossover in a Degenerate Fermi Gas

2005; American Physical Society; Volume: 94; Issue: 17 Linguagem: Inglês

10.1103/physrevlett.94.170402

1092-0145

M. H. Szymańska, Benjamin D. Simons, K. Burnett,

Quantum, superfluid, helium dynamics

We study the short-time dynamics of a degenerate Fermi gas positioned near a Feshbach resonance following an abrupt jump in the atomic interaction resulting from a change of magnetic field. We investigate the dynamics of the condensate order parameter and pair wave function for a range of field strengths. When the jump is sufficient to span the BCS to Bose-Einstein condensation crossover, we show that the rigidity of the momentum distribution precludes any atom-molecule oscillations in the entrance channel dominated resonances observed in $^{40}\mathrm{K}$ and $^{6}\mathrm{Li}$. Focusing on material parameters tailored to the $^{40}\mathrm{K}$ Feshbach resonance at 202.1 G, we comment on the integrity of the fast sweep projection technique as a vehicle to explore the condensed phase in the crossover region.