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Nov 27, 2023 at 16:46 comment added Thomas Coherent means that all pairs with back-to-back momenta $|p_F,-p_F>$ can mix. This does not work if the Fermi surfaces are shifted $|p_F,-p'_F>$ because now the pair momentum is not zero, and different pairs cannot mix by momentum conservation.
Nov 22, 2023 at 15:04 comment added Ghorbalchov What does act coherently over the Fermi surface mean exactly, and why does it depend on the surfaces being shifted?
Nov 17, 2023 at 8:20 vote accept Solidification
Oct 22, 2023 at 4:18 history answered Thomas CC BY-SA 4.0