Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
Author(s)Sommer, Ariel Tjodolv; Wu, Cheng-Hsun; Zwierlein, Martin Wolfram; Schirotzek, Andre
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review Letters
American Physical Society
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.
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