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
复制标题
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
影响因子:
3.7
通讯作者:
T. Yokoyama and M. Eto
中科院分区:
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
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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