Collective excitations of a degenerate gas at the BEC-BCS crossover

Details Collective excitations of a degenerate gas at the BEC-BCS crossover Collective excitations of a degenerate gas at the BEC-BCS crossover

2004-03-29

arxiv.org/abs/cond-mat/0403716v2

Phys. Rev. Lett. 92, 203201 (2004)

Physics

Condensed Matter

Other Condensed Matter

Feshbach resonance position updated, few minor changes

Scientific paper

10.1103/PhysRevLett.92.203201

We study collective excitation modes of a fermionic gas of $^6$Li atoms in the BEC-BCS crossover regime. While measurements of the axial compression mode in the cigar-shaped trap close to a Feshbach resonance confirm theoretical expectations, the radial compression mode shows surprising features. In the strongly interacting molecular BEC regime we observe a negative frequency shift with increasing coupling strength. In the regime of a strongly interacting Fermi gas, an abrupt change in the collective excitation frequency occurs, which may be a signature for a transition from a superfluid to a collisionless phase.

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