Nonequilibrium transport through a Kondo dot in a magnetic field:: Perturbation theory -: art. no. 155330

被引：78

作者：

Paaske, J ^{[1
]}

Rosch, A ^{[1
]}

Wölfle, P ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Theorie Kondensierten Mat, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.69.155330

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using nonequilibrium perturbation theory, we investigate the nonlinear transport through a quantum dot in the Kondo regime in the presence of a magnetic field. We calculate the leading logarithmic corrections to the local magnetization and the differential conductance, which are characteristic of the Kondo effect out of equilibrium. By solving a quantum Boltzmann equation, we determine the nonequilibrium magnetization on the dot and show that the application of both a finite bias voltage and a magnetic field induces a novel structure of logarithmic corrections not present in equilibrium. These corrections lead to more pronounced features in the conductance, and their form calls for a modification of the perturbative renormalization group.

引用

页码：155330 / 1

页数：16

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