Band effects on the conductivity for a two-band Hubbard model

被引：1
|
作者：
Gu, S. -J. [1 ,3 ]
Cao, J. [2 ]
Chen, S. [2 ]
Liu, Y. [1 ,3 ]
Lin, H. -Q. [1 ,3 ]
机构：
[1] Chinese Univ Hong Kong, Inst Theoret Phys, Hong Kong, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[3] Chinese Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL B | 2008年 / 66卷 / 04期
关键词：
D O I：
10.1140/epjb/e2008-00462-8
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The band effects on the conductivity of a one-dimensional two-band Hubbard model is studied based on the ground state energy analysis. It is found that the system with filling factor one is a metal at zero temperature if the on-site interaction U is smaller than a critical value U-c, and is an insulator if U is larger than U-c. The value of metal-insulator transition point U-c is obtained. This result is different from that of 1D single-band Hubbard model where the quantum phase transition point U-c=0. Therefore, the orbital degree of freedom plays an essential role in the states of matter.
引用
收藏
页码：477 / 481
页数：5
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