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Observation of Fermi polarons in a tunable Fermi liquid of ultracold atoms

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 fo...

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Bibliographic Details
Published in:Physical review letters 2009-06, Vol.102 (23), p.230402-230402, Article 230402
Main Authors: Schirotzek, André, Wu, Cheng-Hsun, Sommer, Ariel, Zwierlein, Martin W
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.230402