Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas
Gabriel Wlazłowski, Piotr Magierski, Joaquín E. Drut, Aurel Bulgac, Kenneth J. Roche
DOI 10.1103/PhysRevLett.110.090401 · Physical Review Letters
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Abstract
We present an ab initio determination of the spin response of the unitary Fermi gas. Based on finite temperature quantum Monte Carlo calculations and the Kubo linear-response formalism, we determine the temperature dependence of the spin susceptibility and the spin conductivity. We show that both quantities exhibit suppression above the critical temperature of the superfluid-to-normal phase transition due to Cooper pairing. The spin diffusion transport coefficient does not display a minimum in the vicinity of the critical temperature and drops to very low values Ds≈0.8ℏ/m in the superfluid phase. All these spin observables show a smooth and monotonic behavior with temperature when crossing the critical temperature Tc, until the Fermi liquid regime is attained at the temperature T*, above which the pseudogap regime disappears.
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