Nonadiabatic contribution to the quasiparticle self-energy in systems with strong electron-phonon interaction

被引：16
|
作者：
Danylenko, OV
Dolgov, OV
机构：
[1] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany
[2] Max Planck Inst Festkorperforsch, D-70506 Stuttgart, Germany
来源：
PHYSICAL REVIEW B | 2001年 / 63卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.63.094506
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate effects of a nonadiabatic electron-phonon(boson) interaction on the quasiparticle self-energy in the lowest order in the coupling constant. 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.
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页数：9
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