We report the conductance and average current through a triple-quantum-dot interferometer coupled with two ferromagnetic leads using the nonequilibrium Green’s function. The results show that the interference between the resonant process and the non-resonant process leads to the formation of Fano resonance. More Fano resonances can be observed by applying a time-dependent external field. As a Zeeman magnetic field is applied, the spin-up electron transport is depressed in a certain range of electron energy levels. A spin-polarized pulse device can be realized by adjusting the spin polarization parameters of ferromagnetic leads. Moreover, the I–V characteristic curves show that under the influence of Fano resonance, the spin polarization is significantly enhanced by applying a relatively large reverse bias voltage. These results strongly suggest that the spin-polarized pulse device can be potentially applied as a spin-dependent quantum device.

我们使用非平衡格林函数报告通过三量子点干涉仪与两个铁磁引线耦合的电导和平均电流。结果表明，共振过程和非共振过程的干涉导致了Fano共振的形成。通过应用与时间相关的外部场，可以观察到更多的 Fano 共振。当施加塞曼磁场时，自旋电子传输在一定的电子能级范围内被抑制。通过调整铁磁导线的自旋极化参数，可以实现自旋极化脉冲器件。此外，I - V特性曲线表明，在Fano共振的影响下，通过施加较大的反向偏压，自旋极化显着增强。这些结果强烈表明自旋极化脉冲器件可以潜在地用作自旋相关的量子器件。