Stability analysis of the Hubbard model

被引：61

作者：

Grote, I ^{[1
]}

Körding, E ^{[1
]}

Wegner, F ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2002年 / 126卷 / 3-4期

关键词：

D O I：

10.1023/A:1013804405357

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An effective Hartree-Fock-Bogoliubov-type interaction is calculated for the Hubbard model in second order in the coupling by means of flow equations. A stability analysis is performed in order to obtain the transition into various possible phases. We find, that the second order contribution weakens the tendency for the antiferromagnetic transition. Apart from a possible antiferromagnetic transition the d-wave Pomeranchuk instability recently reported by Halboth and Metzner is usually the, strongest instability. A newly found instability is of p-wave character and yields band-splitting. In the BCS-channel one obtains the strongest contribution for d(x2-y2)-waves. Other types of instabilities of comparable strength are also reported.

引用

页码：1385 / 1409

页数：25

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