Quantum anomalous Hall effect in twisted bilayer graphene
Wen-Xiao Wang(王文晓)1,5, Yi-Wen Liu(刘亦文)2, and Lin He(何林)3,4,†
1 Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China; 2 Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel; 3 Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China; 4 Key Laboratory of Multiscale Spin Physics, Ministry of Education, Beijing 100875, China; 5 Postdoctoral Research Station at Hebei Normal University, Shijiazhuang 050024, China
Abstract Recent advancements in two-dimensional van der Waals moiré materials have unveiled the captivating landscape of moiré physics. In twisted bilayer graphene (TBG) at `magic angles', strong electronic correlations give rise to a diverse array of exotic physical phenomena, including correlated insulating states, superconductivity, magnetism, topological phases, and the quantum anomalous Hall (QAH) effect. Notably, the QAH effect demonstrates substantial promise for applications in electronic and quantum computing devices with low power consumption. This article focuses on the latest developments surrounding the QAH effect in magic-angle TBG. It provides a comprehensive analysis of magnetism and topology - two crucial factors in engineering the QAH effect within magic-angle TBG. Additionally, it offers a detailed overview of the experimental realization of the QAH effect in moiré superlattices. Furthermore, this review highlights the underlying mechanisms driving these exotic phases in moiré materials, contributing to a deeper understanding of strongly interacting quantum systems and facilitating the manipulation of new material properties to achieve novel quantum states.
Fund: This work was supported by the Science Research Project of Hebei Education Department (Grant No. BJK2024168), the National Natural Science Foundation of China (Grant No. 11904076), the Natural Science Foundation of Hebei (Grant No. A2019205313), and Science Foundation of Hebei Normal University (Grant No. L2024J02).
Corresponding Authors:
Lin He
E-mail: helin@bnu.edu.cn
Cite this article:
Wen-Xiao Wang(王文晓), Yi-Wen Liu(刘亦文), and Lin He(何林) Quantum anomalous Hall effect in twisted bilayer graphene 2025 Chin. Phys. B 34 047301
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