Metal-insulator transitions: A simple theoretical model

被引:198
作者
Ramirez, Ricardo [1 ]
Falicov, L. M. [1 ]
Kimball, J. C. [1 ]
机构
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源
PHYSICAL REVIEW B-SOLID STATE | 1970年 / 2卷 / 08期
关键词
D O I
10.1103/PhysRevB.2.3383
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A simple theoretical model for metal-insulator transitions is presented. It is based on the existence of both localized (ionic) and band (Bloch) states. it differs from other theories in that it assumes the one-electron states to be essentially unchanged by the transition. The electron-hole interaction is responsible for the anomalous temperature dependence of the number of conduction electrons. The model is studied in detail for several specific band models, in particular, for an s-like tight-binding cubic structure. The conditions for the presence of metallic and insulating phases at all temperatures as well as for the existence of first-order and higher-order transitions are given. The possibility of formation of bound-exciton states and the scattering mechanism responsible for the resistivity are also discussed.
引用
收藏
页码:3383 / 3393
页数:11
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