Onset of a Pseudogap Regime in Ultracold Fermi Gases

Piotr Magierski, Gabriel Wlazłowski, and Aurel Bulgac
Phys. Rev. Lett. 107, 145304 – Published 27 September 2011
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Abstract

We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (kFa)10.05 (a—scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which, however, do not contribute to the long range order.

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  • Received 21 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.145304

© 2011 American Physical Society

Authors & Affiliations

Piotr Magierski1,2, Gabriel Wlazłowski1, and Aurel Bulgac2

  • 1Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw, Poland
  • 2Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA

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Issue

Vol. 107, Iss. 14 — 30 September 2011

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