Magnetic exchange and nonequilibrium spin current through interacting quantum dots

被引:6
|
作者
Hoffman, Silas [1 ,2 ]
Tserkovnyak, Yaroslav [1 ]
机构
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[2] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland
来源
PHYSICAL REVIEW B | 2015年 / 91卷 / 24期
关键词
TRANSPORT; CONDUCTANCE; ANDERSON; MODEL;
D O I
10.1103/PhysRevB.91.245427
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We develop a theory for charge and spin currents between two cantedmagnetic leads flowing through a quantum dot with an arbitrary local interaction. For a noncollinear magnetic configuration, we calculate equilibrium and nonequilibrium currents biased by voltage or temperature difference or pumped by magnetic dynamics. We are able to explicitly separate the equilibrium and nonequilibrium contributions to the spin current, both of which can be written in terms of the full retarded Green's function on the dot. Taking the specific example of a single-level quantum dot with a large on-site Coulomb interaction, we calculate the total spin current near the Kondo regime, which we find to be generally enhanced in magnitude as compared to the noninteracting case.
引用
收藏
页数:14
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