Polarization Measurements and the Pairing Gap in the Universal Regime

Details Polarization Measurements and the Pairing Gap in the Universal Regime Polarization Measurements and the Pairing Gap in the Universal Regime

2007-11-03

arxiv.org/abs/0711.0414v2

Phys. Rev. Lett. 100, 150403 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Revised verison includes cosmetic changes to the text and figures. One reference added

Scientific paper

10.1103/PhysRevLett.100.150403

We analyze recent cold-atom experiments on imbalanced Fermi systems using a minimal model with a BCS-like superfluid phase coexisting with a normal phase. This model is used to extract the T=0 pairing gap in the fully paired superfluid state. The recently measured particle density profiles are in good agreement with the theoretical predictions obtained from the universal parameters from previous Quantum Monte Carlo calculations. We find that the T=0 pairing gap is greater than 0.4 times the Fermi energy $E_F$, with a preferred value of $0.45 \pm 0.05$ $E_F$. The ratio of the pairing gap $\Delta$ to the Fermi Energy $E_F$ is larger here than in any other system of strongly-paired fermions in which individual pairs are unbound.

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