Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity

Details Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity

2006-08-07

arxiv.org/abs/cond-mat/0608154v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, To be submitted to PRL Minor errors corrected

Scientific paper

10.1103/PhysRevB.76.165116

We study the system of a dilute gas of fermions in 3-dimensions, with attractive interactions tuned to the unitarity point, using the non-perturbative Restricted Path Integral Monte Carlo (R-PIMC) method. The pairing and superfluid properties of this system are calculated at finite temperature. The total energy at very low temperature from our results agrees closely with that of previous ground-state Quantum Monte Carlo calculations. We identify the temperature $T^\ast\approx 0.70\epsilon_F$ below which pairing correlations develop, and estimate the critical temperature for the superfluid transition $T_c\approx 0.25\epsilon_F$ from a finite size scaling analysis of the superfluid density.

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