Hydrodynamic Expansion of a Strongly Interacting Fermi-Fermi Mixture

A. Trenkwalder, C. Kohstall, M. Zaccanti, D. Naik, A. I. Sidorov, F. Schreck, and R. Grimm
Phys. Rev. Lett. 106, 115304 – Published 16 March 2011

Abstract

We report on the expansion of an ultracold Fermi-Fermi mixture of Li6 and K40 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.

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  • Received 23 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.115304

© 2011 American Physical Society

Authors & Affiliations

A. Trenkwalder1, C. Kohstall1,2, M. Zaccanti1,3, D. Naik1, A. I. Sidorov1,4, F. Schreck1, and R. Grimm1,2

  • 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria
  • 2Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria
  • 3LENS, Physics Department, University of Florence and INO-CNR, 50019 Sesto Fiorentino, Italy
  • 4Centre for Atom Optics and Ultrafast Spectroscopy and ARC Centre of Excellence for Quantum-Atom Optics, Swinburne University of Technology, Melbourne, Australia

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Vol. 106, Iss. 11 — 18 March 2011

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