SUPERCONDUCTIVITY IN THE 2-DIMENSIONAL HUBBARD-MODEL - ONE-PARTICLE CORRELATION-FUNCTIONS

被引：67

作者：

PAO, CH

BICKERS, NE

机构：

[1] Department of Physics, University of Southern California, Los Angeles

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.51.16310

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The one-particle correlation functions of a dx2-y2 superconducting state in the two-dimensional Hubbard model are investigated within the fluctuation-exchange approximation. This approximation has been previously applied to investigate properties of the Hubbard-model normal state, including incipient instabilities. Results are obtained for the wave vector and temperature dependence of the one-particle energy gap. A miximum gap ratio 2Δkmax(T=0)/kBTc of order 10 is obtained for intermediate coupling strengths and electron densities near one per site. The potential appearance of spin excitons in two-particle response functions is discussed. © 1995 The American Physical Society.

引用

页码：16310 / 16326

页数：17

共 48 条

[11] CONSERVING APPROXIMATIONS FOR STRONGLY CORRELATED ELECTRON-SYSTEMS - BETHE-SALPETER-EQUATION AND DYNAMICS FOR THE TWO-DIMENSIONAL HUBBARD-MODEL [J].