Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations

被引：13

作者：

Zhang, Hao ^{[1
]}

Zhang, Guang-Ming ^{[2
]}

Yu, Lu ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China

[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 15期

关键词：

All Open Access; Green;

D O I：

10.1088/0953-8984/21/15/155501

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A correct general formula for the spin current through an interacting quantum dot coupled to ferromagnetic leads with magnetization at an arbitrary angle. is derived within the framework of the Keldysh formalism. Under asymmetric conditions, the spin current component J(z) may change sign for 0 < theta < pi. It is shown that the spin current and spin tunneling magnetoresistance exhibit different angle dependence in the free and Coulomb blockade regimes. In the latter case, the competition of the spin precession and the spin-valve effect could lead to an anomaly in the angle dependence of the spin current.

引用

页数：7

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