Magnetically tunable spin-polarization of the current through a double quantum dot device

作者：Pan Hui^*; Wang Cong; Duan Su Qing; Chu Wei Dong; Zhang Wei

来源：Solid State Communications, 2008, 148(1-2): 69-73.

DOI：10.1016/j.ssc.2008.07.003

• coupled quantum dots
• Coulomb-blockade
• spin-dependent transport
• spin-flip effects

We theoretically study the spin-dependent transport in a double quantum dot device connected with normal-metal and ferromagnetic leads by using the nonequilibrium Green';s function method. In the absence of an external magnetic field, the current polarization is zero for a range of positive bias, while it is a relatively large value for a negative bias. In the presence of an external magnetic field perpendicular to the magnetization of the lead, the spin-flip effects make the current spin-polarized for both of the positive and negative bias. Thus the device can operate as a magnetically tunable spin-polarized current diode.

• 出版日期2008-10
• 单位北京航空航天大学; 北京应用物理与计算数学研究所