Johannes Bauer, Jong E. Han, Olle Gunnarsson
We calculate corrections to the conventional result for the Coulomb
pseudopotential in the theory of superconductivity. We find that retardation
effects are still operative for higher order corrections, but less efficient
due to a reduction of the effective bandwidth, leading to larger values of the
pseudopotential and reduced superconductivity. Our calculation are based on a
perturbation expansion for the Hubbard-Holstein model, and the conclusions are
corroborated by comparison with non-perturbative dynamical mean field results.
View original:
http://arxiv.org/abs/1202.5051
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