A slave-boson mean-field theory for general multi-band Hubbard models

被引：9
|
作者：
Buenemann, J. [1 ]
机构：
[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2011年 / 248卷 / 01期
关键词：
correlated electron systems; Gutzwiller theory; Hubbard models; mean-field theory; FUNCTIONAL-INTEGRAL APPROACH; CORRELATED WAVE-FUNCTIONS; GUTZWILLER APPROXIMATION; DEGENERATE BANDS; FERROMAGNETISM; TRANSITION;
D O I：
10.1002/pssb.201046081
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We introduce a new slave-boson mean-field theory which allows the investigation of general multi-band Hubbard models. Unlike earlier attempts of such a generalization, in our approach the quantum-mechanical problem is exactly reformulated in an extended Hilbert space of Fermions and Bosons before a mean-field approximation is applied. Systems with superconducting order parameters are naturally included in our formalism. Our ground-state energy functional agrees with the corresponding quantity derived within the Gutzwiller theory. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：203 / 211
页数：9
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