Hydrodynamic Expansion of a Strongly Interacting Fermi-Fermi Mixture

Year: 2011

Authors: Trenkwalder A., Kohstall C., Zaccanti M., Naik D., Sidorov A. I., Schreck F., Grimm R.

Autors Affiliation: Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria;
Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria;
Univ Florence, Dept Phys, LENS, I-50019 Sesto Fiorentino, Italy;
INO CNR, I-50019 Sesto Fiorentino, Italy;
Swinburne Univ Technol, Ctr Atom Opt & Ultrafast Spect, Melbourne, Vic, Australia;
Swinburne Univ Technol, ARC Ctr Excellence Quantum Atom Opt, Melbourne, Vic, Australia

Abstract: We report on the expansion of an ultracold Fermi-Fermi mixture of (6)Li and (40)K under conditions of strong interactions controlled via an interspecies Feshbach resonance. We study the expansion of the mixture after release from the trap and, in a narrow magnetic-field range, we observe two phenomena related to hydrodynamic behavior. The common inversion of the aspect ratio is found to be accompanied by a collective effect where both species stick together and expand jointly despite of their widely different masses. Our work constitutes a major experimental step for a controlled investigation of the many-body physics of this novel strongly interacting quantum system.


Volume: 106 (11)      Pages from: 115304  to: 115304

More Information: We thank A. Recati, S. Giorgini, and S. Stringari for stimulating discussions and G. Hendl for technical assistance. We acknowledge support by the Austrian Science Fund (FWF) and the European Science Foundation (ESF) within the EuroQUAM/FerMix project and support by the FWF through the SFB FoQuS.
KeyWords: Collective effects; Different mass; Feshbach resonances; Hydrodynamic behavior; Hydrodynamic expansion; Interacting quantum systems; Many-body; Strong interaction; Ultra-cold, Aspect ratio; Fluid dynamics; Hydrodynamics; Mixtures; Quantum electronics; Quantum optics, Expansion
DOI: 10.1103/PhysRevLett.106.115304

Citations: 68
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