OPTICAL CONDUCTIVITY OF THE 2-DIMENSIONAL HUBBARD-MODEL

被引：48

作者：

DAGOTTO, E ^{[1
]}

MOREO, A ^{[1
]}

ORTOLANI, F ^{[1
]}

RIERA, J ^{[1
]}

SCALAPINO, DJ ^{[1
]}

机构：

[1] UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.45.10107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The optical conductivity sigma(1)(omega) of the two-dimensional Hubbard model on finite clusters of 4 x 4 and square root 10 x square root 10 sites is reported. Experimental features found in the high-T(c) cuprate superconductors can be qualitatively reproduced by this model including the presence of mid-infrared spectral weight, a Drude peak whose intensity grows with doping and a total spectral weight that varies slowly as the system is doped away from half filling. We find that to reproduce qualitatively the main experimental features of sigma(1)(omega), we need to work with a coupling constant of the order of the bandwidth, i.e., U/t approximately 8-10. Results for the negative-U Hubbard model are included for comparison.

引用

页码：10107 / 10110

页数：4

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