Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice,Materials Horizons

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Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice
Materials Horizons ( IF 12.2 ) Pub Date : 2020-07-01 , DOI: 10.1039/d0mh00803f
Hao Wang _{1,

2,

3,

4} , Ning Mao _{1,

2,

3,

4} , Chengwang Niu _{1,

2,

3,

4} , Shiying Shen _{1,

2,

3,

4} , Myung-Hwan Whangbo _{2,

3,

4,

5,

6} , Baibiao Huang _{2,

3,

4,

5} , Ying Dai _{1,

2,

3,

4,

5}

Affiliation

Magnetic topological insulators (TIs), including the quantum anomalous Hall effect and antiferromagnetic TIs, have attracted significant attention owing to the exotic properties they give rise to, however, ferromagnetic TIs with gapless surface/edge states and a nonzero topological invariant have not been reported so far. Here, we show that a ferromagnetic topological insulating phenomenon is possible in a single layer honeycomb lattice on the basis of perturbation theory and model Hamiltonian analyses. As a probable candidate for the experimental realization of this phenomenon, we propose a hypothetical single-layer Na₂MnPb with supporting evidence based on first-principles calculations. The topological nature of the single-layer Na₂MnPb is confirmed by calculating the Wannier charge center, the spin Chern number, and the gapless edge states.

中文翻译：

二维蜂窝晶格中的铁磁双拓扑绝缘子

磁性拓扑绝缘体（TIs），包括量子反常霍尔效应和反铁磁TIs，由于其产生的奇异特性而引起了极大的关注，但是，尚未报道具有无间隙表面/边缘态和非零拓扑不变性的铁磁TIs。至今。在这里，我们根据扰动理论和模型哈密顿分析，表明在单层蜂窝晶格中可能存在铁磁拓扑绝缘现象。作为该现象的实验实现的可能候选者，我们基于第一性原理计算，提出了具有支持证据的假想单层Na ₂ MnPb。单层Na ₂的拓扑性质MnPb是通过计算Wannier电荷中心，自旋Chern数和无间隙边缘状态来确定的。

更新日期：2020-09-01

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