Electrical switching of the edge current chirality in quantum anomalous Hall insulators
Electrical switching of the edge current chirality in quantum anomalous Hall insulators
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DOI：
10.1038/s41563-023-01694-y
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发表时间：
2022-05
期刊：
影响因子：
41.2
通讯作者：
Wei Yuan;Lingjie Zhou;Kai-Jheng Yang;Yi-Fan Zhao;Ruoxi Zhang;Zijie Yan;Deyi Zhuo;Ruobing Mei;Yang Wang;H. Yi;M. Chan;M. Kayyalha;Chaoxing Liu;Cui-Zu Chang
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文献类型：
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作者：
Wei Yuan;Lingjie Zhou;Kai-Jheng Yang;Yi-Fan Zhao;Ruoxi Zhang;Zijie Yan;Deyi Zhuo;Ruobing Mei;Yang Wang;H. Yi;M. Chan;M. Kayyalha;Chaoxing Liu;Cui-Zu Chang
量子反常霍尔（QAH）绝缘体是一种拓扑相，其中内部是绝缘的，但电流沿着样品的边缘以顺时针或逆时针方向流动，如自发磁化方向所指示的。这种手性边缘电流消除了任何反向散射，从而产生量子化霍尔电阻和零纵向电阻。在这里，我们制作介观QAH三明治霍尔棒器件，并成功地切换边缘电流手性通过热辅助自旋轨道力矩（SOT）。通过四端和三端测量，证明了SOT开关前后具有相反边缘电流手征的量子化QAH态。我们表明，负责磁化开关的SOT可以由表面和散装载流子产生。我们的结果进一步我们的理解之间的相互作用的磁性和拓扑状态，并迎来一个简单的和瞬时的方法来操纵QAH状态。
A quantum anomalous Hall (QAH) insulator is a topological phase in which the interior is insulating but electrical current flows along the edges of the sample in either a clockwise or counterclockwise direction, as dictated by the spontaneous magnetization orientation. Such a chiral edge current eliminates any backscattering, giving rise to quantized Hall resistance and zero longitudinal resistance. Here we fabricate mesoscopic QAH sandwich Hall bar devices and succeed in switching the edge current chirality through thermally assisted spin–orbit torque (SOT). The well-quantized QAH states before and after SOT switching with opposite edge current chiralities are demonstrated through four- and three-terminal measurements. We show that the SOT responsible for magnetization switching can be generated by both surface and bulk carriers. Our results further our understanding of the interplay between magnetism and topological states and usher in an easy and instantaneous method to manipulate the QAH state.