Renormalization of the electron-phonon interaction in the Hubbard model

被引：0
作者：
Citro, R
Cojocaru, S
Marinaro, M
机构：
[1] Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, Italy
[2] Univ Salerno, Unita INFM Salerno, I-84081 Baronissi, Italy
[3] IIASS, I-84019 Vietri sul Mare, Italy
来源：
PHYSICA B-CONDENSED MATTER | 2005年 / 359卷
关键词：
Hubbard model; electron-phonon interaction;
D O I：
10.1016/j.physb.2005.01.196
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We calculate the electron-phonon vertex in the two-dimensional Hubbard model by a strong coupling approach based on cumulant expansion. The role of the on-site Coulomb interaction on the coupling of the electrons to the Holstein phonons is investigated in different regions of the Brillouin zone. The results reveal the presence of a strong forward scattering and an effective increase of the vertex function at low temperatures above a certain critical U. Comparison with other approaches is also discussed. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：696 / 698
页数：3
相关论文
共 9 条
[1]   Charge fluctuations and electron-phonon interaction in the finite-U Hubbard model -: art. no. 161101 [J].
Cappelluti, E ;
Cerruti, B ;
Pietronero, L .
PHYSICAL REVIEW B, 2004, 69 (16) :161101-1
[2]   Stripe orders driven by long-range Coulomb forces in the 2D-Hubbard model [J].
Citro, R ;
Marinaro, M .
EUROPEAN PHYSICAL JOURNAL B, 2001, 20 (03) :343-348
[3]   ELECTRON-PHONON INTERACTION IN THE PRESENCE OF STRONG CORRELATIONS [J].
GRILLI, M ;
CASTELLANI, C .
PHYSICAL REVIEW B, 1994, 50 (23) :16880-16898
[4]   Electron-phonon vertex in the two-dimensional one-band Hubbard model [J].
Huang, ZB ;
Hanke, W ;
Arrigoni, E ;
Scalapino, DJ .
PHYSICAL REVIEW B, 2003, 68 (22)
[5]   Unconventional isotope effects in cuprate high-temperature superconductors [J].
Keller, H .
PHYSICA B-CONDENSED MATTER, 2003, 326 (1-4) :283-288
[6]   Renormalization of the electron-phonon coupling in the one-band Hubbard model [J].
Koch, E ;
Zeyher, R .
PHYSICAL REVIEW B, 2004, 70 (09) :094510-1
[7]   Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors [J].
Lanzara, A ;
Bogdanov, PV ;
Zhou, XJ ;
Kellar, SA ;
Feng, DL ;
Lu, ED ;
Yoshida, T ;
Eisaki, H ;
Fujimori, A ;
Kishio, K ;
Shimoyama, JI ;
Noda, T ;
Uchida, S ;
Hussain, Z ;
Shen, ZX .
NATURE, 2001, 412 (6846) :510-514
[8]   LINKED-CLUSTER EXPANSION AROUND THE ATOMIC LIMIT OF THE HUBBARD-MODEL [J].
METZNER, W .
PHYSICAL REVIEW B, 1991, 43 (10) :8549-8563
[9]   Renormalization of the electron-phonon interaction by strong electronic correlations in high-T-c superconductors [J].
Zeyher, R ;
Kulic, ML .
PHYSICAL REVIEW B, 1996, 53 (05) :2850-2862
1