COOPER INSTABILITY OF A METALLIC PHASE IN THE HUBBARD-MODEL WITH REPULSION

被引：0
|
作者：
ALISTRATOV, AL
DIMASHKO, YA
PODOLSKII, VS
机构：
来源：
JETP LETTERS | 1993年 / 57卷 / 05期
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D O I：
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The Hubbard model with a local repulsion and a half-filled band is analyzed on a hypercubic lattice. A canonical transformation to electrons and holes reveals a local attraction of these entities and a Cooper instability with respect to their combining to form neutral pairs, i.e., excitons. The ground state of the model is thus an insulator for any finite interaction. It is a state like that of the BCS model, in which excitons play the role of the Cooper pairs.
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页码：325 / 328
页数：4
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