Abstract
Starting from the linearized BdG-equation we make the simple observation that pairing can occur between particles with total momenta different from zero, e.g., with equal momentum and opposite spin, in cases of an effective interaction acting in the center-of-mass coordinates.
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Hainzl, C., Loss, M. General pairing mechanisms in the BCS-theory of superconductivity. Eur. Phys. J. B 90, 82 (2017). https://doi.org/10.1140/epjb/e2017-70318-3
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DOI: https://doi.org/10.1140/epjb/e2017-70318-3