%0 Journal Article %1 Bartenstein2004Collective %A Bartenstein, M. %A Altmeyer, A. %A Riedl, S. %A Jochim, S. %A Chin, C. %A Denschlag, J. Hecker %A Grimm, R. %D 2004 %I American Physical Society %J Physical Review Letters %K cold\_atoms, crossover, experiment %P 203201+ %R 10.1103/physrevlett.92.203201 %T Collective Excitations of a Degenerate Gas at the BEC-BCS Crossover %U http://dx.doi.org/10.1103/physrevlett.92.203201 %V 92 %X We study collective excitation modes of a fermionic gas of 6Li 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.

@article{Bartenstein2004Collective, abstract = {We study collective excitation modes of a fermionic gas of 6Li 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.}, added-at = {2014-01-09T15:14:33.000+0100}, author = {Bartenstein, M. and Altmeyer, A. and Riedl, S. and Jochim, S. and Chin, C. and Denschlag, J. Hecker and Grimm, R.}, biburl = {https://www.bibsonomy.org/bibtex/22eea56c57184b2a60efb81c590365990/jaspervh}, citeulike-article-id = {12241844}, citeulike-linkout-0 = {http://dx.doi.org/10.1103/physrevlett.92.203201}, doi = {10.1103/physrevlett.92.203201}, interhash = {e12898573ff25e316370ef668f58d5bf}, intrahash = {2eea56c57184b2a60efb81c590365990}, journal = {Physical Review Letters}, keywords = {cold\_atoms, crossover, experiment}, month = may, pages = {203201+}, posted-at = {2013-04-04 19:55:49}, priority = {2}, publisher = {American Physical Society}, timestamp = {2014-01-09T15:14:33.000+0100}, title = {Collective Excitations of a Degenerate Gas at the BEC-BCS Crossover}, url = {http://dx.doi.org/10.1103/physrevlett.92.203201}, volume = 92, year = 2004 }