Two-Terminal Spin Filter Using Quantum Dot with Spin-Orbit Interaction in Magnetic Field
Two-Terminal Spin Filter Using Quantum Dot with Spin-Orbit Interaction in Magnetic Field
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DOI：
10.1088/1742-6596/400/4/042075
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
T. Yokoyama;M. Eto
中科院分区：
文献类型：
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作者：
T. Yokoyama;M. Eto
我们提出一种利用具有自旋 - 轨道相互作用和磁场的量子点的双端自旋过滤器。首先，我们研究一个具有两个能级的量子点，将其作为一个最简模型，并得到与自旋相关的电导的解析表达式。当两个能级之间的间距小于由于与电极的隧道耦合导致的能级展宽时，在库仑振荡的电流峰值附近会产生高度自旋极化的电流。接下来，我们使用一个量子点和隧道势垒的实际模型进行数值模拟，并评估我们的自旋过滤器的效率。
We propose a two-terminal spin filter utilizing a quantum dot with spin-orbit interaction and magnetic field. First we examine a quantum dot with two energy-levels, as a minimal model, and obtain an analytical expression for the spin-dependent conductance. When the spacing between the two levels is smaller than the level broadening due to the tunnel coupling to the leads, a largely spin-polarized current is generated around the current peaks of Coulomb oscillation. Next, we perform a numerical simulation using a realistic model for a quantum dot and tunnel barriers and evaluate the efficiency of our spin filter.