Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
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DOI：
10.1103/physrevresearch.2.023195
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发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
Y. Araki;Takahiro Misawa;K. Nomura
中科院分区：
文献类型：
--
作者：
Y. Araki;Takahiro Misawa;K. Nomura
我们从理论上证明了量子自旋霍尔绝缘体（QSHI）的边缘附着在绝缘铁磁体（FM）上可以实现高效的自旋-电荷转换。基于一维QSHI-FM结，分析了FM中磁化动力学驱动下QSHI边缘的电子动力学。在磁交换耦合导致的大禁带开口下，我们发现自旋注入到QSHI边缘得到抑制，同时驱动边缘的电荷电流得到最大化，这是一维螺旋边缘态能带拓扑所要求的.
We theoretically manifest that the edge of a quantum spin Hall insulator (QSHI), attached to an insulating ferromagnet (FM), can realize a highly efficient spin-to-charge conversion. Based on a one-dimensional QSHI-FM junction, the electron dynamics on the QSHI edge is analyzed, driven by a magnetization dynamics in the FM. Under a large gap opening on the edge from the magnetic exchange coupling, we find that the spin injection into the QSHI edge gets suppressed while the charge current driven on the edge gets maximized, demanded by the band topology of the one-dimensional helical edge states.