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
收藏
页码:5133 / 5136
页数:4
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