论文部分内容阅读
利用非平衡格林函数方法,研究了与单个量子点耦合的量子点双链中电子自旋极化输运性质.由于系统中Rashba自旋轨道耦合产生的自旋相关的相位,电子通过上下两种路径时,自旋不同的电子干涉情况不同,从而导致了电极中的自旋极化流.左右两电极间的偏压使单个量子点中的自旋积聚在很大能量区域内能够保持较大的值.由于系统结构的左右不对称,正负偏压下自旋积聚情况完全不同.这些计算结果将有助于实验上设计新型的自旋电子学器件.
The non-equilibrium Green’s function method is used to study the electron spin polarization transport in a quantum dot coupled with a single quantum dot. Due to the spin-dependent phase generated by the Rashba spin orbit coupling in the system, The different electron spins at different spin conditions lead to spin-polarized currents in the electrodes. The bias between the left and right electrodes allows the spins in a single quantum dot to accumulate in a large energy region, maintaining a large Since the left-right asymmetry of the system structure, the positive and negative bias spin-accumulation situation is completely different.These results will contribute to the experimental design of new spintronic devices.