ANHARMONIC LOCAL-MOMENT FLUCTUATIONS IN THE HUBBARD-MODEL

被引：10

作者：

BRENIG, W ^{[1
]}

KAMPF, AP ^{[1
]}

MONIEN, H ^{[1
]}

SCHRIEFFER, JR ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.44.10381

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the role of anharmonic local-moment fluctuations in the two-dimensional Hubbard model for intermediate correlation strength in the regime of local-moment formation. Within a functional-integral scheme we perform a linked-cluster expansion of the effective action up to quartic order in the local-moment amplitudes. The resulting quadratic and quartic expansion coefficients are compared in real space and as a function of frequency, temperature, and chemical potential. We find the quartic contribution to suppress quadratic fluctuations and to be more susceptible to nesting than the quadratic term.

引用

页码：10381 / 10384

页数：4

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