Quantum spin Hall and quantum anomalous Hall states in magnetic Ti2Te2O single layer

凝聚态物理 拓扑绝缘体 反铁磁性 磁性 物理 自旋(空气动力学) 费米能量 量子自旋霍尔效应 费米能级 单层 带隙 量子霍尔效应 绝缘体(电) 量子反常霍尔效应 磁场 材料科学 量子力学 电子 纳米技术 热力学 光电子学
作者
Haiyang Ma,Dandan Guan,Shiyong Wang,Yaoyi Li,Canhua Liu,Hao Zheng,Jinfeng Jia
出处
期刊:Journal of Physics: Condensed Matter [IOP Publishing]
卷期号:33 (21): 21LT01-21LT01 被引量:4
标识
DOI:10.1088/1361-648x/abe647
摘要

Abstract Magnetic topological insulators, such as MnBi 2 Te 4 have attracted great attention recently due to their application to the quantum anomalous Hall (QAH) effect. However, the magnetic quantum spin Hall (QSH) effect in two-dimensional (2D) materials has not yet been reported. Here based on first-principle calculations we find that Ti 2 Te 2 O, a van der Waals layered compound, can cherish both the QAH and QSH states, depending on the magnetic order in its single layer. If the single layer was in a chessboard antiferromagnetic (FM) state, it is a QSH insulator which carries two counterpropagating helical edge states. The spin–orbit-couplings induced bulk band gap can approach as large as 0.31 eV. On the other hand, if the monolayer becomes FM, exchange interactions would push one pair of bands away from the Fermi energy and leave only one chiral edge state remaining, which turns the compound into a Chern insulator (precisely, it is semimetallic with a topologically direct band gap). Both magnetic orders explicitly break the time reversal symmetry and split the energy bands of different spin orientations. To our knowledge, Ti 2 Te 2 O is the first compound that predicted to possess both intrinsic QSH and QAH effects. Our works provide new possibilities to reach a controllable phase transition between two topological nontrivial phases through magnetism tailoring.
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