Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms

Details Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms

2009-02-17

arxiv.org/abs/0902.3021v2

Physical Review Letters 102, 230402 (2009)

Physics

Condensed Matter

Other Condensed Matter

8 pages, 5 figures (includes Supplemental Information) Review Article in Physics: http://physics.aps.org/articles/v2/48

Scientific paper

10.1103/PhysRevLett.102.230402

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.

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