Magnetic field effects on the Andreev transport through a quantum dot

被引：5

作者：

Yamada, Yasuhiro ^{[1
]}

Tanaka, Yoichi ^{[1
]}

Kawakami, Norio ^{[2
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2007年 / 40卷 / 02期

基金：

日本学术振兴会;

关键词：

quantum dot; Andreev reflection; Kondo effect;

D O I：

10.1016/j.physe.2007.06.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We investigate magnetic field effects on the transport through a quantum dot coupled to normal and superconducting leads. Using the modified second-order perturbation theory, we calculate the linear conductance due to the Andreev reflection. It is shown that a maximum structure appearing in the conductance shifts its position with the increase of magnetic field. The detailed analysis of the local density of states and the renormalized parameters elucidates that the maximum of the conductance in magnetic fields clearly characterizes the crossover among the superconducting singlet, the Kondo singlet and the spin-polarized state. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：265 / 268

页数：4

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