Conserving approximation for the three-band Hubbard model: Flat quasiparticle dispersion

被引：26

作者：

Putz, R ^{[1
]}

Preuss, R ^{[1
]}

Muramatsu, A ^{[1
]}

Hanke, W ^{[1
]}

机构：

[1] UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.53.5133

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is shown that the low-energy single-particle spectrum of the three-band Hubbard model at finite hole dopings agrees remarkably well with quantum Monte Carlo and experimental data within the framework of a conserving approximation including self-consistently the interaction with charge, spin, and particle-particle fluctuations. The dispersion of the quasiparticle peak is hat around the (pi,0), (0,pi) points as observed in recent angle-resolved photoemission measurements. The significant reduction of the dispersion near the Fermi level is due to spin fluctuations, rather than being induced by band effects.

引用

页码：5133 / 5136

页数：4

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