Metal-insulator transition in highly correlated systems

被引：2
|
作者：
Busser, C
Anda, EV
Urba, L
Ferrari, V
Chiappe, G
机构：
[1] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22452970 Rio De Janeiro, Brazil
[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷
关键词：
phase transitions - metal-nonmetal; cumulant expansion; highly correlated electrons;
D O I：
10.1016/S0304-8853(97)00995-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose a new formalism to solve the Hubbard Hamiltonian. The Green functions of the many-body systems is obtained from a cumulant diagrammatic expansion. The undress propagator is taken to be the exact result for a small-size cluster obtained using the Lanczos method. The inter-cluster interaction is considered to be the perturbation Hamiltonian. In 1D we reproduce some of the known results. At half filling in 2D we obtain that the system suffers a metal-insulator transition as a function of U. For a finite coordinated Bethe lattice the density of states has a three-peak shape with an Abrikosov-Suhl resonance at the Fermi level. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：311 / 312
页数：2
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