Hydrodynamic Expansion of a Strongly Interacting Fermi-Fermi Mixture
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.
Journal/Review: PHYSICAL REVIEW LETTERS
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, ExpansionDOI: 10.1103/PhysRevLett.106.115304Citations: 59data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-08-09References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here