Superperturbation solver for quantum impurity models

被引：47

作者：

Hafermann, H. ^{[1
]}

Jung, C. ^{[1
]}

Brener, S. ^{[1
]}

Katsnelson, M. I. ^{[2
]}

Rubtsov, A. N. ^{[3
]}

Lichtenstein, A. I. ^{[1
]}

机构：

[1] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany

[2] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands

[3] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia

来源：

EPL | 2009年 / 85卷 / 02期

关键词：

MEAN-FIELD THEORY; INFINITE DIMENSIONS;

D O I：

10.1209/0295-5075/85/27007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a very efficient solver for the general Anderson impurity problem. It is based on the perturbation around a solution obtained from exact diagonalization, using a small number of bath sites. We formulate a perturbation theory which is valid for both weak and strong coupling and interpolates between these limits. Good agreement with numerically exact quantum Monte Carlo results is found for a single bath site over a wide range of parameters. In particular, the Kondo resonance in the intermediate-coupling regime is well reproduced for a single bath site and the lowest-order correction. The method is particularly suited for low temperatures, alleviates analytical continuation of imaginary time data due to the absence of statistical noise and can be generalized to obtain dynamical quantities directly on the real axis. Copyright (C) EPLA, 2009

引用

页数：6

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