arXiv:cond-mat/0410131·v1·cond-mat.other
BCS-BEC crossover with a finite-range interaction
Meera M. Parish🇬🇧 · Bogdan Mihaila🇺🇸 · Eddy M. Timmermans🇺🇸 · Krastan B. Blagoev🇺🇸 · Peter B. Littlewood🇬🇧
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.
Comments: 9 figures