Collective excitations of a degenerate gas at the BEC-BCS crossover |
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Authors: | Bartenstein M Altmeyer A Riedl S Jochim S Chin C Denschlag J Hecker Grimm R |
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Institution: | Institut für Experimentalphysik, Universit?t Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria. |
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Abstract: | 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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