DISORDER VS INTERACTION IN THE HUBBARD-MODEL - PHASE-DIAGRAM IN INFINITE DIMENSIONS

被引：18

作者：

JANIS, V ^{[1
]}

ULMKE, M ^{[1
]}

VOLLHARDT, D ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY

来源：

EUROPHYSICS LETTERS | 1993年 / 24卷 / 04期

关键词：

D O I：

10.1209/0295-5075/24/4/009

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The influence of local disorder on the thermodynamics of interacting electrons is studied within the infinite-dimensional disordered Hubbard model. Using a finite-temperature quantum Monte Carlo method, the averaged local moment and staggered susceptibility are calculated and the magnetic phase diagram at half-filling is constructed. From the averaged compressibility in the paramagnetic and antiferromagnetic phase we determine the metal-insulator transitions of the system. A rich transition scenario is revealed. Quite unexpectedly the disorder is found to stabilize the magnetic order in the strong-coupling limit.

引用

页码：287 / 292

页数：6