量子点双链中电子自旋极化输运性质
Spin-polarized transport through double quantum-dot-array
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摘要: 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.Abstract: The spin-dependent transport through double quantum-dot-array coupled to a single quantum dot is studied by using the nonequilibrium Green function formalism.Due to the quantum interference and the spin-dependent phase induced by Rashba spin-orbit interaction,the spin of the electron through the device is polarized.When the energy level of quantum dot is in the bias window,the spin accumulation in the single quantum dot can maintain a large value in a wide range of energy and the quantum dot is largely spin polarized.The spin accumulations in the single quantum dot under positive bias and negative bias are absolutely different because of asymmetric quantum dot structure.These results is helpful for designing and fabricateing the practical spintronics devices.
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