Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
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Schirotzek-2009-Observation of Fermi.pdf
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Author(s)
Sommer, Ariel Tjodolv
Wu, Cheng-Hsun
Zwierlein, Martin Wolfram
Schirotzek, Andre
Date Issued
June 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Schirotzek, André et al. “Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms.” Physical Review Letters 102.23 (2009): 230402. (C) 2010 The American Physical Society.
Version
Final published version
Abstract
We have observed Fermi polarons, dressed spin-down impurities in a spin-up Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in the impurities’ rf spectrum that emerges from a broad incoherent background. We determine the polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance. At a critical interaction, we observe the transition from polaronic to molecular binding. Here, the imbalanced Fermi liquid undergoes a phase transition into a Bose liquid, coexisting with a Fermi sea.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.230402
