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Paper detail

Phonon Self-Energy Effects in Migdal-Eliashberg Theory

Recent work on an electron-phonon model in two-dimensions is reviewed and some new results are presented. We utilize both Quantum Monte Carlo simulations and Migdal-Eliashberg theory. The type of electron-ion coupling considered is on-site. Competing instabilities are charge density wave (CDW) and singlet superconductivity. When the electron band is half-filled, the charge density wave dominates. Away from half-filling CDW correlations actually suppress superconductivity.

preprint2021arXivOpen access
F. Marsiglio
cond-mat.supr-con
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