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

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

2011-10-15

arxiv.org/abs/1110.3417v1

Phys. Rev. A 82, 063607 (2010)

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1103/PhysRevA.82.063607

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.

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