Effects of three-body scattering processes on BCS-BEC crossover

We investigate the BCS-BEC crossover taking into account an additional three-body interaction, which is essentially the scattering between the Cooper pairs and the newly formed bosons. We show that if the two-body interaction is attractive, the presence of this additional three-body term makes the c...

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Bibliographic Details
Published in:arXiv.org 2011-10
Main Author: Dasgupta, Raka
Format: Article
Language:English
Subjects:
Bosons
Cooper pairs
Crossovers
Helium
Scattering
Online Access:Get full text
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Summary:We investigate the BCS-BEC crossover taking into account an additional three-body interaction, which is essentially the scattering between the Cooper pairs and the newly formed bosons. We show that if the two-body interaction is attractive, the presence of this additional three-body term makes the crossover process a nonreversible one. Starting from a stable Bose-Einstein condensate (BEC) state, crossover to BCS can be achieved; but if the BCS state is the starting point, instead of a stable BEC region, what the system crosses over to is a metastable condensed state.
ISSN:2331-8422
DOI:10.48550/arxiv.1110.3417