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

作者：Zhao Hua; Zhang Xiao-Wei; Cai Tuo; Zhou Guang-Hui^*

来源：Communications in Theoretical Physics, 2011, 55(2): 359-361.

DOI：10.1088/0253-6102/55/2/28

• quantum dot
• spin bias
• spin polarization
• nonequilibrium Green function

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.

• 出版日期2011-2
• 单位湖南师范大学; 黔南民族师范学院