Nature · 2021
Layer Hall effect in a 2D topological axion antiferromagnet
Anyuan Gao, Yu-Fei Liu, Chaowei Hu, Jian-Xiang Qiu, Christian Tzschaschel, Barun Ghosh, Sheng-Chin Ho, Damien Bérubé, Rui Chen, Hai-Peng Sun, Zhaowei Zhang, Xin-Yue Zhang, Yu-Xuan Wang, Naizhou Wang, Zumeng Huang, Claudia Felser, Amit Agarwal, Thomas Ding, Hung-Ju Tien, Austin Akey, Jules Gardener, Bahadur Singh, Kenji Watanabe, Takashi Taniguchi, Kenneth S. Burch, David C. Bell, Brian B. Zhou, Weibo Gao, Hai-Zhou Lu, Arun Bansil, Hsin Lin, Tay-Rong Chang, Liang Fu, Qiong Ma, Ni Ni†, Su-Yang Xu†
Magnetic Topological MatterTopological Quantum Transport
Abstract
We observe a layer Hall effect in even-layered MnBi2Te4, where electrons in different layers deflect in opposite directions. Under a perpendicular electric field, a large layer-polarized anomalous Hall response emerges despite zero net anomalous Hall effect, revealing layer-locked Berry curvature that characterizes the axion-insulator state.
