Generation of spin-polarized current using multiterminal quantum dot with spin-orbit interaction

Generation of spin-polarized current using multiterminal quantum dot with spin-orbit interaction
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使用具有自旋轨道相互作用的多端量子点产生自旋极化电流

DOI:
10.1103/physrevb.86.205305
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
T. Yokoyama and M. Eto
T. Yokoyama and M. Eto
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Inoue A;Kawakami N;Tsuno K;Shimazu A;Tomioka K;Nakanishi M;齋藤亜希;T. Yokoyama and M. Eto

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我们从理论上研究了利用自旋轨道相互作用的多端量子点产生自旋极化电流。首先,将二能级量子点作为一个最小模型进行分析,量子点通过隧道势垒与()个外引线相连。当非极化电流从引线注入量子点时,极化电流被喷射到其他量子点,类似于自旋霍尔效应。在没有磁场的情况下,自旋极化电流的产生需要。当量子点中的能级间距小于由于隧道耦合到引线的能级展宽时,共振隧穿显著增强了极化。在弱磁场中,即使在双端几何中,轨道磁化也会产生自旋极化电流()。对一般情况的数值研究证实了我们的分析结果,使用两个层次的模型。
We theoretically examine generation of spin-polarized current using multiterminal quantum dot with spin-orbit interaction. First, a two-level quantum dot is analyzed as a minimal model, which is connected to() external leads via tunnel barriers. When an unpolarized current is injected to the quantum dot from a lead, a polarized current is ejected to others, similarly to the spin Hall effect. In the absence of magnetic field, the generation of spin-polarized current requires. The polarization is markedly enhanced by resonant tunneling when the level spacing in the quantum dot is smaller than the level broadening due to the tunnel coupling to the leads. In a weak magnetic field, the orbital magnetization creates a spin-polarized current even in the two-terminal geometry (). The numerical study for generalized situations confirms our analytical result using the two-level model.
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