Issue 9, 2020

Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice

Abstract

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.

Graphical abstract: Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice

Supplementary files

Article information

Article type
Communication
Submitted
14 May 2020
Accepted
29 Jun 2020
First published
01 Jul 2020

Mater. Horiz., 2020,7, 2431-2438

Ferromagnetic dual topological insulator in a two-dimensional honeycomb lattice

H. Wang, N. Mao, C. Niu, S. Shen, M. Whangbo, B. Huang and Y. Dai, Mater. Horiz., 2020, 7, 2431 DOI: 10.1039/D0MH00803F

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