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- W1567485917 abstract "We show by explicit calculation of the first order diagrams that vertex corrections to the fermion‐paramagnon interaction are of relative order unity. The consequence of this result is that current paramagnon theories can at best be only qualitatively correct. A full theory of paramagnon effects must take systematic account of vertex corrections. Our result also serves to underline the significant differences between the electron‐phonon and fermion‐paramagnon systems. There is no Migdal theorem for the latter, in contrast to the former case. This happens essentially because the bare fermion‐fermion repulsion I=O(EF), whereas in the phonon case the electron‐phonon coupling g?EF. The absence of a Migdal theorem for paramagnons has important implications for superfluid He3." @default.
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- W1567485917 date "1976-01-01" @default.
- W1567485917 modified "2023-10-12" @default.
- W1567485917 title "The importance of vertex corrections in paramagnon theories" @default.
- W1567485917 doi "https://doi.org/10.1063/1.30647" @default.
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