AN INTRINSIC 1/N EXPANSION FOR MANY-FERMION SYSTEMS

被引：33

作者：

FELDMAN, J

MAGNEN, J

RIVASSEAU, V

TRUBOWITZ, E

机构：

[1] ECOLE POLYTECH,CTR PHYS THEOR,CNRS,UPR 14,F-91128 PALAISEAU,FRANCE

[2] SWISS FED INST TECHNOL,CH-8092 ZURICH,SWITZERLAND

来源：

EUROPHYSICS LETTERS | 1993年 / 24卷 / 06期

关键词：

D O I：

10.1209/0295-5075/24/6/002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The 1/N expansion is a popular tool for investigating non-perturbative long-range phenomena. In many-body models, discretization of the Fermi surface naturally introduces a many-component picture. If, for example, number symmetry is broken, N almost-equal-to (exp [1/lambda])(d-1), where lambda > 0 is the bare coupling constant. We expect that this intrinsic 1/N expansion appears whenever the <<free propagator>> of the system is singular along a hypersurface (for instance, in the Anderson model for localized and extended states).

引用

页码：437 / 442

页数：6