Weak-coupling expansions for the attractive Holstein and Hubbard models

Preprint

17 August 1993

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9308024

Abstract

Weak-coupling expansions (conserving approximations) are carried out for the attractive Holstein and Hubbard models (on an infinite-dimensional hypercubic lattice) that include all bandstructure and vertex correction effects. Quantum fluctuations are found to renormalize transition temperatures by factors of order unity, but may be incorporated into the superconducting channel of Migdal-Eliashberg theory by renormalizing the phonon frequency and the interaction strength.

Keywords

WEAK COUPLING EXPANSIONS
HOLSTEIN AND HUBBARD
ATTRACTIVE HOLSTEIN
SUPERCONDUCTING
HUBBARD MODELS
PHONON

All Related Versions

Version 1, 1993-08-17, ArXiv
Published version: Physical Review B, 49 (9), 6368.

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