Superfluid Pairing Gap in Strong Coupling

J. Carlson and Sanjay Reddy
Phys. Rev. Lett. 100, 150403 – Published 17 April 2008

Abstract

The zero-temperature pairing gap is a fundamental property of interacting Fermions, providing a crucial test of many-body theories in strong coupling. We analyze recent cold-atom experiments on imbalanced Fermi systems using Quantum Monte Carlo results for the superfluid and normal phases. Through this analysis we extract, for the first time, the experimental zero-temperature pairing gap in the fully paired superfluid state at unitarity where the two-body scattering length is infinite. We find that the zero-temperature pairing gap is greater than 0.4 times the Fermi energy EF, with a preferred value of (0.45±0.05) EF. The ratio of the pairing gap to the Fermi Energy is larger here than in any other Fermi system measured to date.

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  • Received 16 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.150403

©2008 American Physical Society

Authors & Affiliations

J. Carlson and Sanjay Reddy

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 100, Iss. 15 — 18 April 2008

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