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Collective excitations of a degenerate gas at the BEC-BCS crossover | | M. Bartenstein
; A. Altmeyer
; S. Riedl
; S. Jochim
; C. Chin
; J. Hecker Denschlag
; R. Grimm
; | | Date: |
30 Mar 2004 | | Journal: | Phys. Rev. Lett. 92, 203201 (2004) DOI: 10.1103/PhysRevLett.92.203201 | | Subject: | Other | cond-mat.other | | 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. | | Source: | arXiv, cond-mat/0403716 | | Other source: | [GID 1104659] pmid15169351 | | Services: | Forum | Review | PDF | Favorites | |
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