Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
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 for various interaction strengths around …