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BCS-BEC crossover with a finite-range interaction

Meera M. Parish·Bogdan Mihaila·Eddy M. Timmermans·Krastan B. Blagoev·Peter B. Littlewood
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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.

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Meera M. Parish, Bogdan Mihaila, Eddy M. Timmermans, Krastan B. Blagoev, Peter B. Littlewood. 2004-10-05. BCS-BEC crossover with a finite-range interaction. https://doi.org/10.1103/physrevb.71.064513

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