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- W2162217814 abstract "We extend a recently introduced separable interaction for the unitary trapped Fermi gas to all values of the scattering length. We derive closed expressions for the interaction matrix elements and the two-particle eigenvectors and analytically demonstrate the convergence of this interaction to the zero-range two-body pseudopotential for s-wave scattering. We apply this effective interaction to the three- and four-particle systems along the BEC-BCS crossover, and find that their low-lying energies exhibit convergence in the regularization parameter that is much faster than for the conventional renormalized contact interaction. We find similar convergence properties of the three-particle free energy at unitarity." @default.
- W2162217814 created "2016-06-24" @default.
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- W2162217814 date "2012-03-15" @default.
- W2162217814 modified "2023-09-24" @default.
- W2162217814 title "Separable effective interaction for the trapped Fermi gas: The BEC-BCS crossover" @default.
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- W2162217814 doi "https://doi.org/10.1103/physreva.85.033621" @default.
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