A Scheme for Spin Manipulation in a Quantum Dot with Both Charge and Spin Bias

We propose a scheme for the effective polarization and manipulation of electron spin by using a quantum dot with both charge and spin bias. Using the equation of motion for Keldysh nonequilibrium Green function, we study the spin accumulation and polarization for the system. Through analytical analy...

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Bibliographic Details
Published inCommunications in theoretical physics Vol. 55; no. 2; pp. 359 - 361
Main Author 赵华 张小伟 蔡托 周光辉
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2011
Subjects
Bias
Charge
Electron spin
Equations of motion
Mathematical analysis
Polarization
Quantum dots
Voltage
函数方程
对称性破缺
数值分析
点电荷
电子自旋极化
量子点
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Summary:We propose a scheme for the effective polarization and manipulation of electron spin by using a quantum dot with both charge and spin bias. Using the equation of motion for Keldysh nonequilibrium Green function, we study the spin accumulation and polarization for the system. Through analytical analysis and a few numerical examples, it is demonstrated that fairly large spin accumulation and polarization can be produced due to the breaking symmetry of the chemical potential for different electron spin in the leads. Moreover, the direction and the strength of the spin polarization can be conveniently controlled and tuned by varying the charge bias or the gate voltage.
Bibliography:quantum dot, spin bias, spin polarization, nonequilibrium Green function
TN201
11-2592/O3
O471.1
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0253-6102
DOI:10.1088/0253-6102/55/2/28