Onset of a Pseudogap Regime in Ultracold Fermi Gases

Details Onset of a Pseudogap Regime in Ultracold Fermi Gases Onset of a Pseudogap Regime in Ultracold Fermi Gases

2011-03-22

arxiv.org/abs/1103.4382v2

Phys. Rev. Lett. 107: 145304,2011

Physics

Condensed Matter

Quantum Gases

5 pages, 4 figures + 5 pages of supplementary online material

Scientific paper

10.1103/PhysRevLett.107.145304

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 (k_{F}a)^{-1}\approx -0.05 (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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