A Scheme for Spin Manipulation in a Quantum Dot with Both Charge and Spin Bias |
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| Authors: | ZHAO Hua ZHANG Xiao-Wei CAI Tuo ZHOU Guang-Hui |
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| Affiliation: | 1.Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;2.Department of Physics, Hunan Normal University, Changsha 410081, China; |
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| Abstract: | 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 breakingsymmetry 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. |
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| Keywords: | quantum dot spin bias spin polarization nonequilibrium Green function |
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