Projecting Fermion Pair Condensates into Molecular Condensates

TL;DR

This paper provides theoretical evidence that recent experimental observations of fermion superfluidity are signatures of large fermion pair condensates, demonstrating universality near resonance and matching observed critical temperatures without adjustable parameters.

Contribution

It introduces crossover theory calculations for various potentials, including two-channel models, to interpret experimental data on fermion superfluids and establish universality.

Findings

Predicted critical temperature matches experimental boundary.

Strong evidence of fermion superfluid signatures.

Universality near resonance confirmed by theory.

Abstract

We offer strong evidence that the recent observations by M. Greiner, C. Regal, and D. Jin and by MIT group are signatures of a fermion superfluid in the strongly interacting regime made up of large fermion pairs. Our conclusions are based on calculations using crossover theory for different potentials including those with the characteristics of two-channel models. Our results demonstrate clearly universality near resonance. The $T_{c}$ predicted by crossover theory is a perfect match with the observed boundary of vanishing condensate fraction with no adjustable parameters.