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

2009/02/28 by Andre Schirotzek, Cheng-Hsun Wu, Ariel Sommer +1 · 4 citations
Physics and Astronomy · #cond-mat.other

paper · pdf · doi:10.1103/physrevlett.102.230402

published as Physical Review Letters 102, 230402 (2009) · 8 pages, 5 figures (includes Supplemental Information) Review Article in Physics: http://physics.aps.org/articles/v2/48

arxiv created 2009/06/09 · arxiv updated 2009/12/01

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.

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• Preparation of a quasi-two-dimensional Bose mixture of ultracold Na <mml:mprescripts/> <mml:none/> 23 and Rb <mml:mprescripts/> <mml:none/> 87 atoms
• Rabi Oscillations of Strongly Driven Bose Polarons

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