BCS-BEC crossover with a finite-range interaction

Details BCS-BEC crossover with a finite-range interaction BCS-BEC crossover with a finite-range interaction

2004-10-05

arxiv.org/abs/cond-mat/0410131v1

Phys.Rev. B71 (2005) 064513

Physics

Condensed Matter

Other Condensed Matter

9 figures

Scientific paper

10.1103/PhysRevB.71.064513

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.

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