Magnetic Field Effects on Quantum-Dot Spin Valves

被引：0

作者：

Gao Jin-Hua ^{[1
,2
]}

Sun Qing-Feng ^{[1
,2
]}

Xie Xin-Cheng ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

[3] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA

来源：

COMMUNICATIONS IN THEORETICAL PHYSICS | 2009年 / 51卷 / 03期

基金：

美国能源部; 中国国家自然科学基金;

关键词：

spin value; spintronics; quantum dot; ZERO-BIAS ANOMALIES; TRANSPORT;

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the magnetic field effects on the spin-polarized transport of the quantum dot (QD) spin valve in the sequential tunneling regime. A set of generalized master equation is derived. Based on that, we discuss the collinear and noncollinear magnetic field effects, respectively. In the collinear magnetic field case, we find that the Zeeman splitting can induce a negative differential conductance (NDC), which is quite different from the one found in previous studies. It has a critical polarization in the parallel arrangement and will disappear in the antiparallel configuration. In the noncollinear magnetic field case, the current shows two plateaus and their angular dependence is analyzed. Although sometimes the two current plateaus have similar angular dependence, their mechanisms are different. Our formalism is also suitable for calculating the transport in magnetic molecules, in which the spin splitting is induced not by a magnetic field by the intrinsic magnetization.

引用

页码：555 / 562

页数：8

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