BCS-BEC crossover with a finite-range interaction
arXiv:cond-mat/0410131 · doi:10.1103/PhysRevB.71.064513
Abstract
We study the crossover from BEC to BCS pairing for dilute systems but with a realistic finite-range interaction. We exhibit the changes in the excitation spectrum that provide a clean qualitative distinction between the two limits. We also study how the dilute system converges to the results from a zero-range pseudo-potential derived by Leggett.
9 figures