Charge instabilities and electron-phonon interaction in the Hubbard-Holstein model

被引：19
|
作者：
Di Ciolo, A. [1 ,2 ]
Lorenzana, J. [1 ,2 ,3 ]
Grilli, M. [1 ,2 ]
Seibold, G. [4 ]
机构：
[1] Univ Roma La Sapienza, CNR, INFM, SMC, I-00185 Rome, Italy
[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[3] CNR, ISC, I-00185 Rome, Italy
[4] Brandenburg Tech Univ Cottbus, Inst Phys, D-03013 Cottbus, Germany
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 08期
关键词：
charge density waves; electron-phonon interactions; exchange interactions (electron); Fermi surface; Hubbard model; Peierls instability; phase separation; GUTZWILLER APPROXIMATION; COULOMB INTERACTIONS; CORRELATED FERMIONS; OPTICAL-ABSORPTION; POLARON FORMATION; LONG-RANGE; SUPERCONDUCTIVITY; DENSITY; LATTICE; RESISTIVITY;
D O I：
10.1103/PhysRevB.79.085101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We consider the Hubbard-Holstein model in the adiabatic limit to investigate the effects of electron-electron interactions on the electron-phonon coupling. To this aim we compute at any momentum and filling the static charge susceptibility of the Hubbard model within the Gutzwiller approximation, and we find that electron-electron correlations effectively screen the electron coupling to the lattice. This screening is more effective at large momenta, and as a consequence, the charge-density-wave phase due to the usual Peierls instability of the Fermi-surface momenta is replaced by a phase-separation instability when the correlations are sizable.
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页数：14
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