Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas

A. Perali, F. Palestini, P. Pieri, G. C. Strinati, J. T. Stewart, J. P. Gaebler, T. E. Drake, and D. S. Jin
Phys. Rev. Lett. 106, 060402 – Published 10 February 2011
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Abstract

Wave-vector resolved radio frequency spectroscopy data for an ultracold trapped Fermi gas are reported for several couplings at Tc, and extensively analyzed in terms of a pairing-fluctuation theory. We map the evolution of a strongly interacting Fermi gas from the pseudogap phase into a fully gapped molecular Bose gas as a function of the interaction strength, which is marked by a rapid disappearance of a remnant Fermi surface in the single-particle dispersion. We also show that our theory of a pseudogap phase is consistent with a recent experimental observation as well as with quantum Monte Carlo data of thermodynamic quantities of a unitary Fermi gas above Tc.

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  • Received 16 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.060402

© 2011 American Physical Society

Authors & Affiliations

A. Perali1, F. Palestini1, P. Pieri1, G. C. Strinati1, J. T. Stewart2, J. P. Gaebler2, T. E. Drake2, and D. S. Jin2

  • 1Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy
  • 2JILA, NIST and University of Colorado, and Department of Physics, University of Colorado, Boulder, Colorado 80309-0449, USA

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Vol. 106, Iss. 6 — 11 February 2011

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