Nonequilibrium transport through a Kondo dot:: Decoherence effects -: art. no. 155301

被引：77
|
作者：
Paaske, J
Rosch, A
Kroha, J
Wölfle, P
机构：
[1] Univ Karlsruhe, Inst Theorie Kondensierten Marine, D-76128 Karlsruhe, Germany
[2] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany
[3] Univ Bonn, Inst Phys, D-53115 Bonn, Germany
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.70.155301
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate the effects of voltage induced spin-relaxation in a quantum dot in the Kondo regime. Using nonequilibrium perturbation theory, we determine the joint effect of self-energy and vertex corrections to the conduction electron T-matrix in the limit of transport voltage much larger than temperature. The logarithmic divergences, developing near the different chemical potentials of the leads, are found to be cut off by spin-relaxation rates, implying that the nonequilibrium Kondo-problem remains at weak coupling as long as voltage is much larger than the Kondo temperature.
引用
收藏
页码：155301 / 1
页数：16
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