Magnetic field effects on transport properties of a quantum dot studied by modified perturbation theory

被引：17

作者：

Takagi, O ^{[1
]}

Saso, T ^{[1
]}

机构：

[1] Saitama Univ, Dept Phys, Urawa, Saitama 3380825, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1999年 / 68卷 / 06期

关键词：

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

D O I：

10.1143/JPSJ.68.1997

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new scheme is proposed for calculating excitation spectrum of a quantum dot expressed by the impurity Anderson model. It is based on the second order perturbation theory with respect to the Coulomb repulsion, but is modified so as to reproduce the correct atomic limit and to fulfil the Friedel sum rule. The magnetic field dependence of both the excitation spectra and the transport properties of a quantum dot is investigated. It is found that the zero bias peak in differential conductance splits under external magnetic field and that negative magnetoresistance will be observed at zero bias voltage in case of electron-hole asymmetry.

引用

页码：1997 / 2005

页数：9

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