Nonadiabatic contribution to the quasiparticle self-energy in systems withstrong electron-phonon interaction - art. no. 094506

Authors
Danylenko, OV Dolgov, OV
Citation
Ov. Danylenko et Ov. Dolgov, Nonadiabatic contribution to the quasiparticle self-energy in systems withstrong electron-phonon interaction - art. no. 094506, PHYS REV B, 6309(9), 2001, pp. 4506
Citations number
33
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6309
Issue
9
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010301)6309:9<4506:NCTTQS>2.0.ZU;2-6
Abstract
We investigate effects of a nonadiabatic electron-phonon(boson) interaction on the quasiparticle self-energy in the lowest order in the coupling const ant. Existing approaches either overestimate or underestimate these effects because of different approximations for momentum and frequency dependences of the vertex corrections. The connection between the nonadiabaticity and a possible instability of the interacting Fermi system is discussed as well .