Many-polaron states in the Holstein-Hubbard model

被引：0
|
作者：
Proville, L
Aubry, S
机构：
[1] Univ Paris 07, CNRS, UMR 7588, Phys Solides Grp, F-75251 Paris 05, France
[2] Univ Paris 06, F-75251 Paris, France
[3] CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France
来源：
JOURNAL OF STATISTICAL PHYSICS | 2002年 / 106卷 / 5-6期
关键词：
polaron; bipolaron; Holstein; Hubbard;
D O I：
10.1023/A:1014046105860
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A variational approach is proposed to study some properties of the adiabatic Holstein-Hubbard model which describes an assembly of fermionic charges interacting with a static atomic lattice. The sum of the electronic energy and the lattice elastic energy is proved to have minima with a many-polaron structure in a certain domain of model parameters. Our analytical work consists in expanding these energy minima from the zero electronic transfer limit which remarkably holds for a finite amplitude of the onsite Hubbard repulsion and for an unbounded lattice size.
引用
收藏
页码：1185 / 1195
页数：11
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