Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi2–xSmxSe3
By C. Yue, Yuanfeng Xu, Zhida Song, H. Weng, Yuan-Ming Lu, Chen Fang, X. Dai. Nature Physics, 2018
152 citations recorded by the source corpus.
The existence of topological hinge states is a key signature for a newly proposed class of topological matter, the second-order topological insulators. In the present paper, a universal mechanism to generate chiral hinge states in the ferromagnetic axion insulator phase is introduced, which leads to an exotic transport phenomenon, the quantum anomalous Hall effect (QAHE) on some particular surfaces determined by both the crystalline symmetry and the magnetization direction. A realistic material system, Sm-doped Bi2Se3, is then proposed to realize such exotic hinge states by combining first-principles calculations and Green’s function techniques. A physically accessible way to manipulate the surface QAHE is also proposed, which makes it very different from the QAHE in ordinary 2D systems. The second-order topological states—chiral hinge states—are predicted in axion insulators, ferromagnetic insulating materials with quantized electromagnetic response. The authors predict such states to occur in Sm-doped Bi2Se3.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/f25916675291662816fd3ed0b060d1babfe7663f
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In Atomic and Molecular Physics, and Optics
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- Ashvin Vishwanath
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In Materials Chemistry
Citations in the corpus
- Colloquium : Quantum anomalous Hall effect (2022, background): “This has led to theoretical proposals of high-order topology in axion insulators (Chen et al., 2021a; Varnava and Vanderbilt, 2018; Wieder and Bernevig, 2018; Xu et al., 2019; Yue et al., 2019; Zhang et al., 2020), in which metallic modes exist at the hinges of finite samples.”