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Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure



Lei Pan, Alexander Grutter, Peng Zhang, Xiaoyu Che, Tomohiro Nozaki, Alex Stern, Mike Street, Bing Zhang, Brian Casas, Qing L. He, Eun S. Choi, Steven M. Disseler, Dustin Gilbert, Gen Yin, Qiming Shao, Peng Deng, Yingying Wu, Xiaoyang Liu, Xufeng Kou, Sahashi Masashi, Xiaodong Han, Christian Binek, Scott Chambers, Jing Xia, Kang L. Wang


Integration of a quantum anomalous Hall insulator with a magnetically ordered material provides an additional degree of freedom through which we may control the resulting exotic quantum states. Here, we report an experimental observation of the quantum anomalous Hall effect in a magnetically-doped topological insulator grown on the antiferromagnetic insulator Cr2O3. We investigate the exchange coupling between the two materials using field-cooling-dependent magnetometry and polarized neutron reflectometry. Both techniques reveal strong interfacial interaction between the antiferromagnetic order of the Cr2O3 and the magnetic topological insulator, manifested as an exchange bias when the sample is field-cooled under an out-of-plane magnetic field, and an exchange spring-like magnetic depth profile when the system is magnetized within the film plane. Our results identify antiferromagnetic insulators as suitable candidates for the manipulation of magnetic and topological order in topological insulator films.
Advanced Materials


Magnetism, topology, Quantum anomalous hall effect, topological insulator, antiferromagnet, thin film


Pan, L. , Grutter, A. , Zhang, P. , Che, X. , Nozaki, T. , Stern, A. , Street, M. , Zhang, B. , Casas, B. , He, Q. , Choi, E. , Disseler, S. , Gilbert, D. , Yin, G. , Shao, Q. , Deng, P. , Wu, Y. , Liu, X. , Kou, X. , Masashi, S. , Han, X. , Binek, C. , Chambers, S. , Xia, J. and Wang, K. (2020), Observation of Quantum Anomalous Hall Effect and Exchange Interaction in Topological Insulator/Antiferromagnet Heterostructure, Advanced Materials (Accessed March 2, 2024)
Created August 26, 2020, Updated September 28, 2021