Pairing and charge-density-wave correlations in the Holstein model at half-filling
- 1 August 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (4) , 2416-2424
- https://doi.org/10.1103/physrevb.42.2416
Abstract
We study the two-dimensional Holstein model at half-filling for small systems using quantum Monte Carlo methods and through diagrammatic perturbation techniques in the Migdal-Eliashberg approximation. It is found that the latter approximation is very accurate as long as the phonon self-energy is taken into account in a self-consistent way. Vertex corrections are not required.Keywords
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