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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 23
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Phys. Rev. Lett. 102, 230402 (2009) [4 pages]

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

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André Schirotzek, Cheng-Hsun Wu, Ariel Sommer, and Martin W. Zwierlein
Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Received 17 February 2009; revised 9 April 2009; published 8 June 2009

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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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.230402
DOI:
10.1103/PhysRevLett.102.230402
PACS:
05.30.Fk, 03.75.Ss, 32.30.Bv, 67.60.Fp
 
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