Modified perturbation theory applied to Kondo-type transport through a quantum dot under a magnetic field

被引：13

作者：

Takagi, O ^{[1
]}

Saso, T ^{[1
]}

机构：

[1] Saitama Univ, Dept Phys, Urawa, Saitama 3388570, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1999年 / 68卷 / 09期

关键词：

quantum dot; Anderson model; Kondo effect; perturbation theory; conductance; magnetic field;

D O I：

10.1143/JPSJ.68.2894

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Linear conductance through a quantum dot is calculated under a finite magnetic field using the modified perturbation theory. The method is based on the second-order perturbation theory with respect to the Coulomb repulsion, but the self-energy is modified to reproduce the correct atomic limit and to fulfill the Friedel sum rule exactly. Although this method is applicable only to zero temperature in a strict sense, it is approximately extended to finite temperatures. it is found that the conductance near electron-hole symmetry is suppressed by the application of the magnetic field at low temperatures. Positive magnetoconductance is observed in the case of large electron-hole asymmetry.

引用

页码：2894 / 2897

页数：4

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