Spectral densities for response functions of a marginal Fermi liquid model

被引：1

作者：

Bradley, S

Bulla, R

Hewson, AC

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2BZ, England

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

来源：

PHYSICA B-CONDENSED MATTER | 1999年 / 259-61卷

基金：

英国工程与自然科学研究理事会;

关键词：

numerical renormalization group; two-channel kondo model; marginal Fermi liquid;

D O I：

10.1016/S0921-4526(98)00980-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The O(3) symmetric Anderson model has a Fermi liquid or marginal Fermi liquid low-energy fixed point, dependent on the parameter V(0), the hybridization matrix element to a local Majorana fermion mode. We use the numerical renormalization group method to calculate the spectral densities. For V(0) = 0 (non-Fermi-liquid case) there is a zero mode in the one-particle spectrum with a weight which decreases exponentially with U for large U. The scattering with this zero mode induces a \omega\ low energy behavior in the single-particle response functions and a In lot divergence in the dynamic spin susceptibility. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：362 / 363

页数：2

共 5 条

[1] Low-energy fixed points of the sigma-tau and the O(3) symmetric Anderson models [J].