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Collective Excitations of a Degenerate Gas at the BEC-BCS Crossover
Open accessAbstract
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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Cited by
Many-body physics with ultracold gases
Bloch, I., Dalibard, J., & Zwerger, W. (2008) · Reviews of Modern Physics · doi:10.1103/revmodphys.80.885 · Cited by 8,114
Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
Lewenstein, M., Sanpera, A., Ahufinger, V., Damski, B., Sen(De), A., & Sen, U. (2007) · Advances in Physics · doi:10.1080/00018730701223200 · Cited by 2,104
Dicke quantum phase transition with a superfluid gas in an optical cavity
Baumann, K., Guerlin, C., Brennecke, F., & Esslinger, T. (2010) · Nature · doi:10.1038/nature09009 · Cited by 1,530
Vortices and superfluidity in a strongly interacting Fermi gas
Zwierlein, M. W., Abo-Shaeer, J. R., Schirotzek, A., Schunck, C. H., & Ketterle, W. (2005) · Nature · doi:10.1038/nature03858 · Cited by 1,016
Nearly perfect fluidity: from cold atomic gases to hot quark gluon plasmas
Schäfer, T., & Teaney, D. (2009) · Reports on Progress in Physics · doi:10.1088/0034-4885/72/12/126001 · Cited by 438
Metadata
- Authors
- Bartenstein, M., Altmeyer, A., Riedl, S., Jochim, S., Chin, C., Denschlag, J. H., & Grimm, R.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2004-05-19
- Volume
- 92
- Issue
- 20
- Pages
- 203201-203201
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2037722155
- Cited by
- 605
- References
- 0
- FWCI
- 44.23
- Type
- journal article
- Language
- en
- Open access
- green
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- Bartenstein, M., Altmeyer, A., Riedl, S., Jochim, S., Chin, C., Denschlag, J. H., & Grimm, R. (2004). Collective Excitations of a Degenerate Gas at the BEC-BCS Crossover. Physical Review Letters. https://doi.org/10.1103/physrevlett.92.203201
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