Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan.
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
Science. 2017 Dec 8;358(6368):1311-1314. doi: 10.1126/science.aan5991.
Electronic ordering in magnetic and dielectric materials forms domains with different signs of order parameters. The control of configuration and motion of the domain walls (DWs) enables nonvolatile responses against minute external fields. Here, we realize chiral edge states (CESs) on the magnetic DWs of a magnetic topological insulator. We design and fabricate the magnetic domains in the quantum anomalous Hall state with the tip of a magnetic force microscope and prove the existence of the chiral one-dimensional edge conduction along the prescribed DWs through transport measurements. The proof-of-concept devices based on reconfigurable CESs and Landauer-Büttiker formalism are realized for multiple-domain configurations with well-defined DW channels. Our results may lead to the realization of low-power-consumption spintronic devices.
电子在具有不同有序参数符号的磁性和介电材料中有序，控制畴壁（DW）的组态和运动可以对微小的外部场做出非易失性响应。在这里，我们在磁性拓扑绝缘体的磁性 DW 上实现了手征边缘态（CES）。我们通过磁力显微镜的针尖设计并制造了量子反常霍尔态中的磁性畴，通过输运测量证明了沿着预定 DW 存在手征一维边缘传导。基于可重构 CES 和 Landauer-Büttiker 形式主义的概念验证器件实现了具有明确定义 DW 通道的多畴构型。我们的结果可能会导致低功耗的自旋电子器件的实现。
