平行耦合双量子点分子A-B干涉仪的电荷及其自旋输运

利用非平衡格林函数方法,理论研究每臂中嵌有一个平行耦合双量子点分子的A-B干涉仪(平行耦合双量子点分子A-B干涉仪)的电荷及其自旋输运性质.无外磁场时,与每臂中嵌有一个量子点的A-B干涉仪相比较,平行耦合双量子点分子A-B干涉仪中电子隧穿变得更加容易发生.当平行耦合双量子点分子A-B干涉仪中引入外磁场时,能够在电导能谱中观察到一个Fano共振和一个反共振,这两种输运状态在磁场取适当数值时能够同时消失.此外,通过调节左右两电极间的偏压、磁通和Rashba自旋轨道相互作用,可以对体系自旋输运进行调控.

Charge and spin transport through parallel-coupled double-quantum-dot molecule A-B interferometer

By using the nonequilibrium Green’s function technique, the charge and spin transport properties through an A-B interferometer that has a parallel-coupled double-quantum-dot molecule embedded in each arm, (named as parallel-coupled double-quantum-dot molecule A-B interferometer) are investigated. In the absence of magnetic flux, as compared with the A-B interferometer with two quantum dots embedded in each arm, electron tunnelling becomes far easier for parallel-coupled double-quantum-dot molecule A-B interferometer. When the magnetic field is introduced, one can observe in the conductance spectrum one Fano resonance and one anti-resonance, both of which will die away simultaneously when the magnetic flux takes a proper value. Besides, spin transport can be manipulated by tuning the bias voltage between the two leads, magnetic flux, and Rashba spin orbit interaction.