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Spin polarons and molecules in strongly interacting atomic Fermi gases

P. Massignan, G. M. Bruun, and H. T. C. Stoof
Phys. Rev. A 78, 031602(R) – Published 24 September 2008

Abstract

We examine pairing and molecule formation in strongly interacting Fermi gases, and we discuss how radio-frequency (rf) spectroscopy can reveal these features. For the balanced case, the emergence of stable molecules in the Bose-Einstein condensation regime results in a two-peak structure in the rf spectrum with clearly visible medium effects on the low-energy part of the molecular wave function. For the highly imbalanced case, we show the existence of a well-defined quasiparticle (a spin polaron) on both sides of the Feshbach resonance, we evaluate its lifetime, and we illustrate how its energy may be measured by rf spectroscopy.

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  • Received 23 May 2008

DOI:https://doi.org/10.1103/PhysRevA.78.031602

©2008 American Physical Society

Authors & Affiliations

P. Massignan1, G. M. Bruun2,3, and H. T. C. Stoof1

  • 1Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
  • 2Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy
  • 3Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark

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Issue

Vol. 78, Iss. 3 — September 2008

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