自旋电子学
拓扑绝缘体
Berry连接和曲率
凝聚态物理
拓扑(电路)
物理
量子自旋霍尔效应
磁场
量子霍尔效应
量子力学
几何相位
铁磁性
数学
组合数学
作者
Jue Jiang,Di Xiao,Fei Wang,Jaeho Shin,Domenico Andreoli,Jianxiao Zhang,Run Xiao,Yi‐Fan Zhao,Morteza Kayyalha,Ling Zhang,Ke Wang,Jiadong Zang,Chao‐Xing Liu,Nitin Samarth,Moses H. W. Chan,Cui‐Zu Chang
出处
期刊:Nature Materials
[Springer Nature]
日期:2020-02-03
卷期号:19 (7): 732-737
被引量:26
标识
DOI:10.1038/s41563-020-0605-z
摘要
The quantum anomalous Hall (QAH) effect is a consequence of non-zero Berry curvature in momentum space. The QAH insulator harbours dissipation-free chiral edge states in the absence of an external magnetic field. However, the topological Hall (TH) effect, a hallmark of chiral spin textures, is a consequence of real-space Berry curvature. Here, by inserting a topological insulator (TI) layer between two magnetic TI layers, we realized the concurrence of the TH effect and the QAH effect through electric-field gating. The TH effect is probed by bulk carriers, whereas the QAH effect is characterized by chiral edge states. The appearance of the TH effect in the QAH insulating regime is a consequence of chiral magnetic domain walls that result from the gate-induced Dzyaloshinskii–Moriya interaction and occurs during the magnetization reversal process in the magnetic TI sandwich samples. The coexistence of chiral edge states and chiral spin textures provides a platform for proof-of-concept dissipationless spin-textured spintronic applications. The coexistence of chiral edge states and chiral spin textures in magnetic topological insulator sandwiches provides a platform for proof-of-concept dissipationless spin-textured spintronic applications.
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